vindexes

package
v0.12.1 Latest Latest
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 Go to latest Published: Dec 14, 2021 License: Apache-2.0 Imports: 35 Imported by: 9

Documentation

Overview

Copyright 2021 The Vitess Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

Constants

View Source 
const (
	TypeSequence  = "sequence"
	TypeReference = "reference"
)

The following constants represent table types.

Variables

View Source 
var TabletTypeSuffix = map[topodatapb.TabletType]string{
	0: "@unknown",
	1: "@primary",
	2: "@replica",
	3: "@rdonly",
	4: "@spare",
	5: "@experimental",
	6: "@backup",
	7: "@restore",
	8: "@drained",
}

TabletTypeSuffix maps the tablet type to its suffix string.

Functions

func ChooseVindexForType 

func ChooseVindexForType(typ querypb.Type) (string, error)

ChooseVindexForType chooses the most appropriate vindex for the give type.

func LoadFormal 

func LoadFormal(filename string) (*vschemapb.SrvVSchema, error)

LoadFormal loads the JSON representation of VSchema from a file.

func LoadFormalKeyspace 

func LoadFormalKeyspace(filename string) (*vschemapb.Keyspace, error)

LoadFormalKeyspace loads the JSON representation of VSchema from a file, for a single keyspace.

func Map 

func Map(vindex Vindex, vcursor VCursor, rowsColValues [][]sqltypes.Value) ([]key.Destination, error)

Map invokes the Map implementation supplied by the vindex.

func NewKeyRangeFromPrefix added in v0.11.0 

func NewKeyRangeFromPrefix(begin []byte) key.Destination

NewKeyRangeFromPrefix creates a keyspace range from a prefix of keyspace id.

func Register 

func Register(vindexType string, newVindexFunc NewVindexFunc)

Register registers a vindex under the specified vindexType. A duplicate vindexType will generate a panic. New vindexes will be created using these functions at the time of vschema loading.

func ValidateKeyspace 

func ValidateKeyspace(input *vschemapb.Keyspace) error

ValidateKeyspace ensures that the keyspace vschema is valid. External references (like sequence) are not validated.

func Verify 

func Verify(vindex Vindex, vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify invokes the Verify implementation supplied by the vindex.

Types

type AutoIncrement 

type AutoIncrement struct {
	Column   sqlparser.ColIdent `json:"column"`
	Sequence *Table             `json:"sequence"`
}

AutoIncrement contains the auto-inc information for a table.

func (*AutoIncrement) CachedSize added in v0.10.0 

func (cached *AutoIncrement) CachedSize(alloc bool) int64

type Binary 

type Binary struct {
	// contains filtered or unexported fields
}

Binary is a vindex that converts binary bits to a keyspace id.

func (*Binary) CachedSize added in v0.10.0 

func (cached *Binary) CachedSize(alloc bool) int64

func (*Binary) Cost 

func (vind *Binary) Cost() int

Cost returns the cost as 1.

func (*Binary) IsUnique 

func (vind *Binary) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*Binary) Map 

func (vind *Binary) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*Binary) NeedsVCursor 

func (vind *Binary) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*Binary) ReverseMap 

func (*Binary) ReverseMap(_ VCursor, ksids [][]byte) ([]sqltypes.Value, error)

ReverseMap returns the associated ids for the ksids.

func (*Binary) String 

func (vind *Binary) String() string

String returns the name of the vindex.

func (*Binary) Verify 

func (vind *Binary) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type BinaryMD5 

type BinaryMD5 struct {
	// contains filtered or unexported fields
}

BinaryMD5 is a vindex that hashes binary bits to a keyspace id.

func (*BinaryMD5) CachedSize added in v0.10.0 

func (cached *BinaryMD5) CachedSize(alloc bool) int64

func (*BinaryMD5) Cost 

func (vind *BinaryMD5) Cost() int

Cost returns the cost as 1.

func (*BinaryMD5) IsUnique 

func (vind *BinaryMD5) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*BinaryMD5) Map 

func (vind *BinaryMD5) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*BinaryMD5) NeedsVCursor 

func (vind *BinaryMD5) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*BinaryMD5) String 

func (vind *BinaryMD5) String() string

String returns the name of the vindex.

func (*BinaryMD5) Verify 

func (vind *BinaryMD5) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type ByCost 

type ByCost []*ColumnVindex

ByCost provides the interface needed for ColumnVindexes to be sorted by cost order.

func (ByCost) Len 

func (bc ByCost) Len() int

func (ByCost) Less 

func (bc ByCost) Less(i, j int) bool

func (ByCost) Swap 

func (bc ByCost) Swap(i, j int)

type CFC added in v0.11.0 

type CFC struct {
	// contains filtered or unexported fields
}

CFC is Concatenated Fixed-width Composite Vindex.

The purpose of this vindex is to shard the rows based on the prefix of sharding key. Imagine the sharding key is defined as (s1, s2, ... sN), a prefix of this key is (s1, s2, ... sj) (j <= N). This vindex puts the rows with the same prefix among a same group of shards instead of scatter them around all the shards. The benefit of doing so is that prefix queries will only fanout to a subset of shards instead of all the shards. Specifically this vindex maps the full key, i.e. (s1, s2, ... sN) to a `key.DestinationKeyspaceID` and the prefix of it, i.e. (s1, s2, ... sj)(j<N) to a `key.DestinationKeyRange`. Note that the prefix to key range mapping is only active in 'LIKE' expression. When a column with CFC defined appears in other expressions, e.g. =, !=, IN etc, it behaves exactly as other functional unique vindexes.

This provides the capability to model hierarchical data models. If we consider the prefix as the 'parent' key and the full key as the 'child' key, all the child data is clustered within the same group of shards identified by the 'parent' key.

Due to the prevalance of using `vindexes.SingleColumn` in vindexes, it's way more complex to implement a true multi-column composite index (see github issue) than to implement it using a single column vindex where the components of the composite keys are concatenated together to form a single key. The user can use this single key directly as the keyspace id; one can also define a hash function so that the keyspace id is the concatenation of hash(s1), hash(s2), ... hash(sN). Using the concatenated key directly makes it easier to reason the fanout but the data distribution depends on the key itself; while using the hash on components takes care of the randomness of the data distribution.

Since the vindex is on a concatenated key, the offsets into the key are the only way to mark its components. Thus it implicitly requires each component to have a fixed width, except the last one. It's especially true when hash is defined. Because the hash is calculated component by component, only the prefix that aligns with the component boundary can be used to compute the key range. Although the misaligned part doesn't participate the key range calculation, the SQL executed on each shard uses the unchanged prefix; thus the behavior is exactly same as other vindex's but just more efficient in controlling the fanout.

The expected format of the vindex definition is 

"vindexes": {
  "cfc_md5": {
    "type": "cfc",
    "params": {
      "hash": "md5",
      "offsets": "[2,4]"
    }
  }
}

'offsets' only makes sense when hash is used. Offsets should be a sorted list of positive ints, each of which denotes the byte offset (from the beginning of key) of each component's boundary in the concatenated key. Specifically, offsets[0] is the byte offset of the first component, offsets[1] is the byte offset of the second component, etc.

func (*CFC) CachedSize added in v0.11.0 

func (cached *CFC) CachedSize(alloc bool) int64

func (*CFC) Cost added in v0.11.0 

func (vind *CFC) Cost() int

Cost returns the cost as 1. In regular mode, i.e. not in a LIKE op, CFC has pretty much the same cost as other unique vindexes like 'binary', 'md5' etc.

func (*CFC) IsUnique added in v0.11.0 

func (vind *CFC) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*CFC) Map added in v0.11.0 

func (vind *CFC) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*CFC) NeedsVCursor added in v0.11.0 

func (vind *CFC) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*CFC) PrefixVindex added in v0.11.0 

func (vind *CFC) PrefixVindex() SingleColumn

PrefixVindex switches the vindex to prefix mode

func (*CFC) String added in v0.11.0 

func (vind *CFC) String() string

func (*CFC) Verify added in v0.11.0 

func (vind *CFC) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type Column 

type Column struct {
	Name sqlparser.ColIdent `json:"name"`
	Type querypb.Type       `json:"type"`
}

Column describes a column.

func (*Column) CachedSize added in v0.10.0 

func (cached *Column) CachedSize(alloc bool) int64

func (*Column) MarshalJSON 

func (col *Column) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of Column.

type ColumnVindex 

type ColumnVindex struct {
	Columns []sqlparser.ColIdent `json:"columns"`
	Type    string               `json:"type"`
	Name    string               `json:"name"`
	Owned   bool                 `json:"owned,omitempty"`
	Vindex  Vindex               `json:"vindex"`
}

ColumnVindex contains the index info for each index of a table.

func FindBestColVindex 

func FindBestColVindex(table *Table) (*ColumnVindex, error)

FindBestColVindex finds the best ColumnVindex for VReplication.

func FindVindexForSharding 

func FindVindexForSharding(tableName string, colVindexes []*ColumnVindex) (*ColumnVindex, error)

FindVindexForSharding searches through the given slice to find the lowest cost unique vindex primary vindex is always unique if two have the same cost, use the one that occurs earlier in the definition if the final result is too expensive, return nil

func (*ColumnVindex) CachedSize added in v0.10.0 

func (cached *ColumnVindex) CachedSize(alloc bool) int64

type ConsistentLookup 

type ConsistentLookup struct {
	// contains filtered or unexported fields
}

ConsistentLookup is a non-unique lookup vindex that can stay consistent with respect to its owner table.

func (*ConsistentLookup) CachedSize added in v0.10.0 

func (cached *ConsistentLookup) CachedSize(alloc bool) int64

func (*ConsistentLookup) Cost 

func (lu *ConsistentLookup) Cost() int

Cost returns the cost of this vindex as 20.

func (ConsistentLookup) Create 

func (lu ConsistentLookup) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (ConsistentLookup) Delete 

func (lu ConsistentLookup) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*ConsistentLookup) IsUnique 

func (lu *ConsistentLookup) IsUnique() bool

IsUnique returns false since the Vindex is non unique.

func (*ConsistentLookup) Map 

func (lu *ConsistentLookup) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (ConsistentLookup) MarshalJSON 

func (lu ConsistentLookup) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of clCommon.

func (*ConsistentLookup) NeedsVCursor 

func (lu *ConsistentLookup) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (ConsistentLookup) SetOwnerInfo 

func (lu ConsistentLookup) SetOwnerInfo(keyspace, table string, cols []sqlparser.ColIdent) error

func (ConsistentLookup) String 

func (lu ConsistentLookup) String() string

String returns the name of the vindex.

func (ConsistentLookup) Update 

func (lu ConsistentLookup) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (ConsistentLookup) Verify 

func (lu ConsistentLookup) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type ConsistentLookupUnique 

type ConsistentLookupUnique struct {
	// contains filtered or unexported fields
}

ConsistentLookupUnique defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's Unique and a Lookup.

func (*ConsistentLookupUnique) CachedSize added in v0.10.0 

func (cached *ConsistentLookupUnique) CachedSize(alloc bool) int64

func (*ConsistentLookupUnique) Cost 

func (lu *ConsistentLookupUnique) Cost() int

Cost returns the cost of this vindex as 10.

func (ConsistentLookupUnique) Create 

func (lu ConsistentLookupUnique) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (ConsistentLookupUnique) Delete 

func (lu ConsistentLookupUnique) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*ConsistentLookupUnique) IsBackfilling added in v0.12.0 

func (lu *ConsistentLookupUnique) IsBackfilling() bool

IsBackfilling implements the LookupBackfill interface

func (*ConsistentLookupUnique) IsUnique 

func (lu *ConsistentLookupUnique) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*ConsistentLookupUnique) Map 

func (lu *ConsistentLookupUnique) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (ConsistentLookupUnique) MarshalJSON 

func (lu ConsistentLookupUnique) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of clCommon.

func (*ConsistentLookupUnique) NeedsVCursor 

func (lu *ConsistentLookupUnique) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (ConsistentLookupUnique) SetOwnerInfo 

func (lu ConsistentLookupUnique) SetOwnerInfo(keyspace, table string, cols []sqlparser.ColIdent) error

func (ConsistentLookupUnique) String 

func (lu ConsistentLookupUnique) String() string

String returns the name of the vindex.

func (ConsistentLookupUnique) Update 

func (lu ConsistentLookupUnique) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (ConsistentLookupUnique) Verify 

func (lu ConsistentLookupUnique) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type Hash 

type Hash struct {
	// contains filtered or unexported fields
}

Hash defines vindex that hashes an int64 to a KeyspaceId by using null-key DES hash. It's Unique, Reversible and Functional. Note that at once stage we used a 3DES-based hash here, but for a null key as in our case, they are completely equivalent.

func (*Hash) CachedSize added in v0.10.0 

func (cached *Hash) CachedSize(alloc bool) int64

func (*Hash) Cost 

func (vind *Hash) Cost() int

Cost returns the cost of this index as 1.

func (*Hash) IsUnique 

func (vind *Hash) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*Hash) Map 

func (vind *Hash) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*Hash) NeedsVCursor 

func (vind *Hash) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*Hash) ReverseMap 

func (vind *Hash) ReverseMap(_ VCursor, ksids [][]byte) ([]sqltypes.Value, error)

ReverseMap returns the ids from ksids.

func (*Hash) String 

func (vind *Hash) String() string

String returns the name of the vindex.

func (*Hash) Verify 

func (vind *Hash) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type Keyspace 

type Keyspace struct {
	Name    string
	Sharded bool
}

Keyspace contains the keyspcae info for each Table.

func (*Keyspace) CachedSize added in v0.10.0 

func (cached *Keyspace) CachedSize(alloc bool) int64

type KeyspaceSchema 

type KeyspaceSchema struct {
	Keyspace *Keyspace
	Tables   map[string]*Table
	Vindexes map[string]Vindex
	Error    error
}

KeyspaceSchema contains the schema(table) for a keyspace.

func BuildKeyspaceSchema 

func BuildKeyspaceSchema(input *vschemapb.Keyspace, keyspace string) (*KeyspaceSchema, error)

BuildKeyspaceSchema builds the vschema portion for one keyspace. The build ignores sequence references because those dependencies can go cross-keyspace.

func (*KeyspaceSchema) MarshalJSON 

func (ks *KeyspaceSchema) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of KeyspaceSchema.

type Lookup 

type Lookup interface {
	// Create creates an association between ids and ksids. If ignoreMode
	// is true, then the Create should ignore dup key errors.
	Create(vc VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

	Delete(vc VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

	// Update replaces the mapping of old values with new values for a keyspace id.
	Update(vc VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error
}

A Lookup vindex is one that needs to lookup a previously stored map to compute the keyspace id from an id. This means that the creation of a lookup vindex entry requires a keyspace id as input. A Lookup vindex need not be unique because the keyspace_id, which must be supplied, can be used to determine the target shard for an insert operation.

type LookupBackfill added in v0.12.0 

type LookupBackfill interface {
	IsBackfilling() bool
}

LookupBackfill interfaces all lookup vindexes that can backfill rows, such as LookupUnique.

type LookupHash 

type LookupHash struct {
	// contains filtered or unexported fields
}

LookupHash defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's NonUnique and a Lookup. Warning: This Vindex is being depcreated in favor of Lookup

func (*LookupHash) CachedSize added in v0.10.0 

func (cached *LookupHash) CachedSize(alloc bool) int64

func (*LookupHash) Cost 

func (lh *LookupHash) Cost() int

Cost returns the cost of this vindex as 20.

func (*LookupHash) Create 

func (lh *LookupHash) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupHash) Delete 

func (lh *LookupHash) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupHash) IsUnique 

func (lh *LookupHash) IsUnique() bool

IsUnique returns false since the Vindex is not unique.

func (*LookupHash) Map 

func (lh *LookupHash) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupHash) MarshalJSON 

func (lh *LookupHash) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupHash.

func (*LookupHash) NeedsVCursor 

func (lh *LookupHash) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupHash) String 

func (lh *LookupHash) String() string

String returns the name of the vindex.

func (*LookupHash) Update 

func (lh *LookupHash) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupHash) Verify 

func (lh *LookupHash) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type LookupHashUnique 

type LookupHashUnique struct {
	// contains filtered or unexported fields
}

LookupHashUnique defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's Unique and a Lookup. Warning: This Vindex is being depcreated in favor of LookupUnique

func (*LookupHashUnique) CachedSize added in v0.10.0 

func (cached *LookupHashUnique) CachedSize(alloc bool) int64

func (*LookupHashUnique) Cost 

func (lhu *LookupHashUnique) Cost() int

Cost returns the cost of this vindex as 10.

func (*LookupHashUnique) Create 

func (lhu *LookupHashUnique) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupHashUnique) Delete 

func (lhu *LookupHashUnique) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupHashUnique) IsBackfilling added in v0.12.0 

func (lhu *LookupHashUnique) IsBackfilling() bool

IsBackfilling implements the LookupBackfill interface

func (*LookupHashUnique) IsUnique 

func (lhu *LookupHashUnique) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*LookupHashUnique) Map 

func (lhu *LookupHashUnique) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupHashUnique) MarshalJSON 

func (lhu *LookupHashUnique) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupHashUnique.

func (*LookupHashUnique) NeedsVCursor 

func (lhu *LookupHashUnique) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupHashUnique) String 

func (lhu *LookupHashUnique) String() string

String returns the name of the vindex.

func (*LookupHashUnique) Update 

func (lhu *LookupHashUnique) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupHashUnique) Verify 

func (lhu *LookupHashUnique) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type LookupNonUnique 

type LookupNonUnique struct {
	// contains filtered or unexported fields
}

LookupNonUnique defines a vindex that uses a lookup table and create a mapping between from ids and KeyspaceId. It's NonUnique and a Lookup.

func (*LookupNonUnique) CachedSize added in v0.10.0 

func (cached *LookupNonUnique) CachedSize(alloc bool) int64

func (*LookupNonUnique) Cost 

func (ln *LookupNonUnique) Cost() int

Cost returns the cost of this vindex as 20.

func (*LookupNonUnique) Create 

func (ln *LookupNonUnique) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupNonUnique) Delete 

func (ln *LookupNonUnique) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupNonUnique) IsUnique 

func (ln *LookupNonUnique) IsUnique() bool

IsUnique returns false since the Vindex is non unique.

func (*LookupNonUnique) Map 

func (ln *LookupNonUnique) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupNonUnique) MarshalJSON 

func (ln *LookupNonUnique) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupHash.

func (*LookupNonUnique) NeedsVCursor 

func (ln *LookupNonUnique) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupNonUnique) String 

func (ln *LookupNonUnique) String() string

String returns the name of the vindex.

func (*LookupNonUnique) Update 

func (ln *LookupNonUnique) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupNonUnique) Verify 

func (ln *LookupNonUnique) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type LookupUnicodeLooseMD5Hash 

type LookupUnicodeLooseMD5Hash struct {
	// contains filtered or unexported fields
}

LookupUnicodeLooseMD5Hash defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's NonUnique and a Lookup and stores the from value in a hashed form. Warning: This Vindex is being depcreated in favor of Lookup

func (*LookupUnicodeLooseMD5Hash) CachedSize added in v0.10.0 

func (cached *LookupUnicodeLooseMD5Hash) CachedSize(alloc bool) int64

func (*LookupUnicodeLooseMD5Hash) Cost 

func (lh *LookupUnicodeLooseMD5Hash) Cost() int

Cost returns the cost of this vindex as 20.

func (*LookupUnicodeLooseMD5Hash) Create 

func (lh *LookupUnicodeLooseMD5Hash) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupUnicodeLooseMD5Hash) Delete 

func (lh *LookupUnicodeLooseMD5Hash) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupUnicodeLooseMD5Hash) IsUnique 

func (lh *LookupUnicodeLooseMD5Hash) IsUnique() bool

IsUnique returns false since the Vindex is not unique.

func (*LookupUnicodeLooseMD5Hash) Map 

func (lh *LookupUnicodeLooseMD5Hash) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupUnicodeLooseMD5Hash) MarshalJSON 

func (lh *LookupUnicodeLooseMD5Hash) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupHash.

func (*LookupUnicodeLooseMD5Hash) NeedsVCursor 

func (lh *LookupUnicodeLooseMD5Hash) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupUnicodeLooseMD5Hash) String 

func (lh *LookupUnicodeLooseMD5Hash) String() string

String returns the name of the vindex.

func (*LookupUnicodeLooseMD5Hash) Update 

func (lh *LookupUnicodeLooseMD5Hash) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupUnicodeLooseMD5Hash) Verify 

func (lh *LookupUnicodeLooseMD5Hash) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type LookupUnicodeLooseMD5HashUnique 

type LookupUnicodeLooseMD5HashUnique struct {
	// contains filtered or unexported fields
}

LookupUnicodeLooseMD5HashUnique defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's Unique and a Lookup and will store the from value in a hashed format. Warning: This Vindex is being depcreated in favor of LookupUnique

func (*LookupUnicodeLooseMD5HashUnique) CachedSize added in v0.10.0 

func (cached *LookupUnicodeLooseMD5HashUnique) CachedSize(alloc bool) int64

func (*LookupUnicodeLooseMD5HashUnique) Cost 

func (lhu *LookupUnicodeLooseMD5HashUnique) Cost() int

Cost returns the cost of this vindex as 10.

func (*LookupUnicodeLooseMD5HashUnique) Create 

func (lhu *LookupUnicodeLooseMD5HashUnique) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupUnicodeLooseMD5HashUnique) Delete 

func (lhu *LookupUnicodeLooseMD5HashUnique) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupUnicodeLooseMD5HashUnique) IsBackfilling added in v0.12.0 

func (lhu *LookupUnicodeLooseMD5HashUnique) IsBackfilling() bool

IsBackfilling implements the LookupBackfill interface

func (*LookupUnicodeLooseMD5HashUnique) IsUnique 

func (lhu *LookupUnicodeLooseMD5HashUnique) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*LookupUnicodeLooseMD5HashUnique) Map 

func (lhu *LookupUnicodeLooseMD5HashUnique) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupUnicodeLooseMD5HashUnique) MarshalJSON 

func (lhu *LookupUnicodeLooseMD5HashUnique) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupHashUnique.

func (*LookupUnicodeLooseMD5HashUnique) NeedsVCursor 

func (lhu *LookupUnicodeLooseMD5HashUnique) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupUnicodeLooseMD5HashUnique) String 

func (lhu *LookupUnicodeLooseMD5HashUnique) String() string

String returns the name of the vindex.

func (*LookupUnicodeLooseMD5HashUnique) Update 

func (lhu *LookupUnicodeLooseMD5HashUnique) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupUnicodeLooseMD5HashUnique) Verify 

func (lhu *LookupUnicodeLooseMD5HashUnique) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type LookupUnique 

type LookupUnique struct {
	// contains filtered or unexported fields
}

LookupUnique defines a vindex that uses a lookup table. The table is expected to define the id column as unique. It's Unique and a Lookup.

func (*LookupUnique) CachedSize added in v0.10.0 

func (cached *LookupUnique) CachedSize(alloc bool) int64

func (*LookupUnique) Cost 

func (lu *LookupUnique) Cost() int

Cost returns the cost of this vindex as 10.

func (*LookupUnique) Create 

func (lu *LookupUnique) Create(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte, ignoreMode bool) error

Create reserves the id by inserting it into the vindex table.

func (*LookupUnique) Delete 

func (lu *LookupUnique) Delete(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksid []byte) error

Delete deletes the entry from the vindex table.

func (*LookupUnique) IsBackfilling added in v0.12.0 

func (lu *LookupUnique) IsBackfilling() bool

IsBackfilling implements the LookupBackfill interface

func (*LookupUnique) IsUnique 

func (lu *LookupUnique) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*LookupUnique) Map 

func (lu *LookupUnique) Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*LookupUnique) MarshalJSON 

func (lu *LookupUnique) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of LookupUnique.

func (*LookupUnique) NeedsVCursor 

func (lu *LookupUnique) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*LookupUnique) String 

func (lu *LookupUnique) String() string

String returns the name of the vindex.

func (*LookupUnique) Update 

func (lu *LookupUnique) Update(vcursor VCursor, oldValues []sqltypes.Value, ksid []byte, newValues []sqltypes.Value) error

Update updates the entry in the vindex table.

func (*LookupUnique) Verify 

func (lu *LookupUnique) Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type MultiColumn 

type MultiColumn interface {
	Vindex
	Map(vcursor VCursor, rowsColValues [][]sqltypes.Value) ([]key.Destination, error)
	Verify(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte) ([]bool, error)
}

MultiColumn defines the interface for a multi-column vindex.

type NewVindexFunc 

type NewVindexFunc func(string, map[string]string) (Vindex, error)

A NewVindexFunc is a function that creates a Vindex based on the properties specified in the input map. Every vindex must register a NewVindexFunc under a unique vindexType.

type NotFoundError added in v0.9.0 

type NotFoundError struct {
	TableName string
}

NotFoundError represents the error where the table name was not found

func (NotFoundError) Error added in v0.9.0 

func (n NotFoundError) Error() string

type Null 

type Null struct {
	// contains filtered or unexported fields
}

Null defines a vindex that always return 0. It's Unique and Functional. This is useful for rows that always go into the first shard. This Vindex can be used for validating an unsharded->sharded transition. Unlike other vindexes, this one will work even for NULL input values. This will allow you to keep MySQL auto-inc columns unchanged.

func (*Null) CachedSize added in v0.10.0 

func (cached *Null) CachedSize(alloc bool) int64

func (*Null) Cost 

func (vind *Null) Cost() int

Cost returns the cost of this index as 100.

func (*Null) IsUnique 

func (vind *Null) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*Null) Map 

func (vind *Null) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*Null) NeedsVCursor 

func (vind *Null) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*Null) String 

func (vind *Null) String() string

String returns the name of the vindex.

func (*Null) Verify 

func (vind *Null) Verify(cursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type Numeric 

type Numeric struct {
	// contains filtered or unexported fields
}

Numeric defines a bit-pattern mapping of a uint64 to the KeyspaceId. It's Unique and Reversible.

func (*Numeric) CachedSize added in v0.10.0 

func (cached *Numeric) CachedSize(alloc bool) int64

func (*Numeric) Cost 

func (*Numeric) Cost() int

Cost returns the cost of this vindex as 0.

func (*Numeric) IsUnique 

func (*Numeric) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*Numeric) Map 

func (*Numeric) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*Numeric) NeedsVCursor 

func (*Numeric) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*Numeric) ReverseMap 

func (*Numeric) ReverseMap(_ VCursor, ksids [][]byte) ([]sqltypes.Value, error)

ReverseMap returns the associated ids for the ksids.

func (*Numeric) String 

func (vind *Numeric) String() string

String returns the name of the vindex.

func (*Numeric) Verify 

func (*Numeric) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids and ksids match.

type NumericLookupTable 

type NumericLookupTable map[uint64]uint64

NumericLookupTable stores the mapping of keys.

type NumericStaticMap 

type NumericStaticMap struct {
	// contains filtered or unexported fields
}

NumericStaticMap is similar to vindex Numeric but first attempts a lookup via a JSON file.

func (*NumericStaticMap) CachedSize added in v0.10.0 

func (cached *NumericStaticMap) CachedSize(alloc bool) int64

func (*NumericStaticMap) Cost 

func (*NumericStaticMap) Cost() int

Cost returns the cost of this vindex as 1.

func (*NumericStaticMap) IsUnique 

func (vind *NumericStaticMap) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*NumericStaticMap) Map 

func (vind *NumericStaticMap) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*NumericStaticMap) NeedsVCursor 

func (vind *NumericStaticMap) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*NumericStaticMap) String 

func (vind *NumericStaticMap) String() string

String returns the name of the vindex.

func (*NumericStaticMap) Verify 

func (vind *NumericStaticMap) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids and ksids match.

type Prefixable added in v0.11.0 

type Prefixable interface {
	SingleColumn
	PrefixVindex() SingleColumn
}

A Prefixable vindex is one that maps the prefix of a id to a keyspace range instead of a single keyspace id. It's being used to reduced the fan out for 'LIKE' expressions.

type RegionExperimental 

type RegionExperimental struct {
	// contains filtered or unexported fields
}

RegionExperimental is a multi-column unique vindex. The first column is prefixed to the hash of the second column to produce the keyspace id. RegionExperimental can be used for geo-partitioning because the first column can denote a region, and its value will dictate the shard for that region.

func (*RegionExperimental) CachedSize added in v0.10.0 

func (cached *RegionExperimental) CachedSize(alloc bool) int64

func (*RegionExperimental) Cost 

func (ge *RegionExperimental) Cost() int

Cost returns the cost of this index as 1.

func (*RegionExperimental) IsUnique 

func (ge *RegionExperimental) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*RegionExperimental) Map 

func (ge *RegionExperimental) Map(vcursor VCursor, rowsColValues [][]sqltypes.Value) ([]key.Destination, error)

Map satisfies MultiColumn.

func (*RegionExperimental) NeedsVCursor 

func (ge *RegionExperimental) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*RegionExperimental) String 

func (ge *RegionExperimental) String() string

String returns the name of the vindex.

func (*RegionExperimental) Verify 

func (ge *RegionExperimental) Verify(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify satisfies MultiColumn.

type RegionJSON 

type RegionJSON struct {
	// contains filtered or unexported fields
}

RegionJSON is a multi-column unique vindex The first column is used to lookup the prefix part of the keyspace id, the second column is hashed, and the two values are combined to produce the keyspace id. RegionJson can be used for geo-partitioning because the first column can denote a region, and it will dictate the shard range for that region.

func (*RegionJSON) CachedSize added in v0.10.0 

func (cached *RegionJSON) CachedSize(alloc bool) int64

func (*RegionJSON) Cost 

func (rv *RegionJSON) Cost() int

Cost returns the cost of this index as 1.

func (*RegionJSON) IsUnique 

func (rv *RegionJSON) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*RegionJSON) Map 

func (rv *RegionJSON) Map(vcursor VCursor, rowsColValues [][]sqltypes.Value) ([]key.Destination, error)

Map satisfies MultiColumn.

func (*RegionJSON) NeedsVCursor 

func (rv *RegionJSON) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*RegionJSON) String 

func (rv *RegionJSON) String() string

String returns the name of the vindex.

func (*RegionJSON) Verify 

func (rv *RegionJSON) Verify(vcursor VCursor, rowsColValues [][]sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify satisfies MultiColumn

type RegionMap 

type RegionMap map[string]uint64

RegionMap is used to store mapping of country to region

type ReverseBits 

type ReverseBits struct {
	// contains filtered or unexported fields
}

ReverseBits defines vindex that reverses the bits of a number. It's Unique, Reversible and Functional.

func (*ReverseBits) CachedSize added in v0.10.0 

func (cached *ReverseBits) CachedSize(alloc bool) int64

func (*ReverseBits) Cost 

func (vind *ReverseBits) Cost() int

Cost returns the cost of this index as 1.

func (*ReverseBits) IsUnique 

func (vind *ReverseBits) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*ReverseBits) Map 

func (vind *ReverseBits) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map returns the corresponding KeyspaceId values for the given ids.

func (*ReverseBits) NeedsVCursor 

func (vind *ReverseBits) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*ReverseBits) ReverseMap 

func (vind *ReverseBits) ReverseMap(_ VCursor, ksids [][]byte) ([]sqltypes.Value, error)

ReverseMap returns the ids from ksids.

func (*ReverseBits) String 

func (vind *ReverseBits) String() string

String returns the name of the vindex.

func (*ReverseBits) Verify 

func (vind *ReverseBits) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type Reversible 

type Reversible interface {
	SingleColumn
	ReverseMap(vcursor VCursor, ks [][]byte) ([]sqltypes.Value, error)
}

A Reversible vindex is one that can perform a reverse lookup from a keyspace id to an id. This is optional. If present, VTGate can use it to fill column values based on the target keyspace id. Reversible is supported only for SingleColumn vindexes.

type RoutingRule 

type RoutingRule struct {
	Tables []*Table
	Error  error
}

RoutingRule represents one routing rule.

func (*RoutingRule) MarshalJSON 

func (rr *RoutingRule) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON representation of Column.

type SingleColumn 

type SingleColumn interface {
	Vindex
	// Map can map ids to key.Destination objects.
	// If the Vindex is unique, each id would map to either
	// a KeyRange, or a single KeyspaceID.
	// If the Vindex is non-unique, each id would map to either
	// a KeyRange, or a list of KeyspaceID.
	Map(vcursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

	// Verify returns true for every id that successfully maps to the
	// specified keyspace id.
	Verify(vcursor VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)
}

SingleColumn defines the interface for a single column vindex.

type Table 

type Table struct {
	Type                    string               `json:"type,omitempty"`
	Name                    sqlparser.TableIdent `json:"name"`
	Keyspace                *Keyspace            `json:"-"`
	ColumnVindexes          []*ColumnVindex      `json:"column_vindexes,omitempty"`
	Ordered                 []*ColumnVindex      `json:"ordered,omitempty"`
	Owned                   []*ColumnVindex      `json:"owned,omitempty"`
	AutoIncrement           *AutoIncrement       `json:"auto_increment,omitempty"`
	Columns                 []Column             `json:"columns,omitempty"`
	Pinned                  []byte               `json:"pinned,omitempty"`
	ColumnListAuthoritative bool                 `json:"column_list_authoritative,omitempty"`
}

Table represents a table in VSchema.

func (*Table) CachedSize added in v0.10.0 

func (cached *Table) CachedSize(alloc bool) int64

type UnicodeLooseMD5 

type UnicodeLooseMD5 struct {
	// contains filtered or unexported fields
}

UnicodeLooseMD5 is a vindex that normalizes and hashes unicode strings to a keyspace id. It conservatively converts the string to its base characters before hashing. This is also known as UCA level 1. Ref: http://www.unicode.org/reports/tr10/#Multi_Level_Comparison. This is compatible with MySQL's utf8_unicode_ci collation.

func (*UnicodeLooseMD5) CachedSize added in v0.10.0 

func (cached *UnicodeLooseMD5) CachedSize(alloc bool) int64

func (*UnicodeLooseMD5) Cost 

func (vind *UnicodeLooseMD5) Cost() int

Cost returns the cost as 1.

func (*UnicodeLooseMD5) IsUnique 

func (vind *UnicodeLooseMD5) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*UnicodeLooseMD5) Map 

func (vind *UnicodeLooseMD5) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*UnicodeLooseMD5) NeedsVCursor 

func (vind *UnicodeLooseMD5) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*UnicodeLooseMD5) String 

func (vind *UnicodeLooseMD5) String() string

String returns the name of the vindex.

func (*UnicodeLooseMD5) Verify 

func (vind *UnicodeLooseMD5) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type UnicodeLooseXXHash added in v0.8.0 

type UnicodeLooseXXHash struct {
	// contains filtered or unexported fields
}

UnicodeLooseXXHash is a vindex that normalizes and hashes unicode strings to a keyspace id. It conservatively converts the string to its base characters before hashing. This is also known as UCA level 1. Ref: http://www.unicode.org/reports/tr10/#Multi_Level_Comparison. This is compatible with MySQL's utf8_unicode_ci collation.

func (*UnicodeLooseXXHash) CachedSize added in v0.10.0 

func (cached *UnicodeLooseXXHash) CachedSize(alloc bool) int64

func (*UnicodeLooseXXHash) Cost added in v0.8.0 

func (vind *UnicodeLooseXXHash) Cost() int

Cost returns the cost as 1.

func (*UnicodeLooseXXHash) IsUnique added in v0.8.0 

func (vind *UnicodeLooseXXHash) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*UnicodeLooseXXHash) Map added in v0.8.0 

func (vind *UnicodeLooseXXHash) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*UnicodeLooseXXHash) NeedsVCursor added in v0.8.0 

func (vind *UnicodeLooseXXHash) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*UnicodeLooseXXHash) String added in v0.8.0 

func (vind *UnicodeLooseXXHash) String() string

String returns the name of the vindex.

func (*UnicodeLooseXXHash) Verify added in v0.8.0 

func (vind *UnicodeLooseXXHash) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

type VCursor 

type VCursor interface {
	Execute(method string, query string, bindvars map[string]*querypb.BindVariable, rollbackOnError bool, co vtgatepb.CommitOrder) (*sqltypes.Result, error)
	ExecuteKeyspaceID(keyspace string, ksid []byte, query string, bindVars map[string]*querypb.BindVariable, rollbackOnError, autocommit bool) (*sqltypes.Result, error)
	InTransactionAndIsDML() bool
	LookupRowLockShardSession() vtgatepb.CommitOrder
}

A VCursor is an interface that allows you to execute queries in the current context and session of a VTGate request. Vindexes can use this interface to execute lookup queries.

type VSchema 

type VSchema struct {
	RoutingRules map[string]*RoutingRule `json:"routing_rules"`

	Keyspaces map[string]*KeyspaceSchema `json:"keyspaces"`
	// contains filtered or unexported fields
}

VSchema represents the denormalized version of SrvVSchema, used for building routing plans.

func BuildVSchema 

func BuildVSchema(source *vschemapb.SrvVSchema) (vschema *VSchema)

BuildVSchema builds a VSchema from a SrvVSchema.

func (*VSchema) FindRoutedTable added in v0.9.0 

func (vschema *VSchema) FindRoutedTable(keyspace, tablename string, tabletType topodatapb.TabletType) (*Table, error)

FindRoutedTable finds a table checking the routing rules.

func (*VSchema) FindTable 

func (vschema *VSchema) FindTable(keyspace, tablename string) (*Table, error)

FindTable returns a pointer to the Table. If a keyspace is specified, only tables from that keyspace are searched. If the specified keyspace is unsharded and no tables matched, it's considered valid: FindTable will construct a table of that name and return it. If no keyspace is specified, then a table is returned only if its name is unique across all keyspaces. If there is only one keyspace in the vschema, and it's unsharded, then all table requests are considered valid and belonging to that keyspace. FindTable bypasses routing rules and returns at most one table.

func (*VSchema) FindTableOrVindex added in v0.8.0 

func (vschema *VSchema) FindTableOrVindex(keyspace, name string, tabletType topodatapb.TabletType) (*Table, Vindex, error)

FindTableOrVindex finds a table or a Vindex by name using Find and FindVindex.

func (*VSchema) FindVindex 

func (vschema *VSchema) FindVindex(keyspace, name string) (Vindex, error)

FindVindex finds a vindex by name. If a keyspace is specified, only vindexes from that keyspace are searched. If no kesypace is specified, then a vindex is returned only if its name is unique across all keyspaces. The function returns an error only if the vindex name is ambiguous.

type Vindex 

type Vindex interface {
	// String returns the name of the Vindex instance.
	// It's used for testing and diagnostics. Use pointer
	// comparison to see if two objects refer to the same
	// Vindex.
	String() string

	// Cost is used by planbuilder to prioritize vindexes.
	// The cost can be 0 if the id is basically a keyspace id.
	// The cost can be 1 if the id can be hashed to a keyspace id.
	// The cost can be 2 or above if the id needs to be looked up
	// from an external data source. These guidelines are subject
	// to change in the future.
	Cost() int

	// IsUnique returns true if the Vindex is unique.
	// A Unique Vindex is allowed to return non-unique values like
	// a keyrange. This is in situations where the vindex does not
	// have enough information to map to a keyspace id. If so, such
	// a vindex cannot be primary.
	IsUnique() bool

	// NeedsVCursor returns true if the Vindex makes calls into the
	// VCursor. Such vindexes cannot be used by vreplication.
	NeedsVCursor() bool
}

Vindex defines the interface required to register a vindex.

func CreateVindex 

func CreateVindex(vindexType, name string, params map[string]string) (Vindex, error)

CreateVindex creates a vindex of the specified type using the supplied params. The type must have been previously registered.

func NewBinary 

func NewBinary(name string, _ map[string]string) (Vindex, error)

NewBinary creates a new Binary.

func NewBinaryMD5 

func NewBinaryMD5(name string, _ map[string]string) (Vindex, error)

NewBinaryMD5 creates a new BinaryMD5.

func NewCFC added in v0.11.0 

func NewCFC(name string, params map[string]string) (Vindex, error)

NewCFC creates a new CFC vindex

func NewConsistentLookup 

func NewConsistentLookup(name string, m map[string]string) (Vindex, error)

NewConsistentLookup creates a ConsistentLookup vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

func NewConsistentLookupUnique 

func NewConsistentLookupUnique(name string, m map[string]string) (Vindex, error)

NewConsistentLookupUnique creates a ConsistentLookupUnique vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

func NewHash 

func NewHash(name string, m map[string]string) (Vindex, error)

NewHash creates a new Hash.

func NewLookup 

func NewLookup(name string, m map[string]string) (Vindex, error)

NewLookup creates a LookupNonUnique vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause inserts to upsert and deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewLookupHash 

func NewLookupHash(name string, m map[string]string) (Vindex, error)

NewLookupHash creates a LookupHash vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause inserts to upsert and deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewLookupHashUnique 

func NewLookupHashUnique(name string, m map[string]string) (Vindex, error)

NewLookupHashUnique creates a LookupHashUnique vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewLookupUnicodeLooseMD5Hash 

func NewLookupUnicodeLooseMD5Hash(name string, m map[string]string) (Vindex, error)

NewLookupUnicodeLooseMD5Hash creates a LookupUnicodeLooseMD5Hash vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause inserts to upsert and deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewLookupUnicodeLooseMD5HashUnique 

func NewLookupUnicodeLooseMD5HashUnique(name string, m map[string]string) (Vindex, error)

NewLookupUnicodeLooseMD5HashUnique creates a LookupUnicodeLooseMD5HashUnique vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewLookupUnique 

func NewLookupUnique(name string, m map[string]string) (Vindex, error)

NewLookupUnique creates a LookupUnique vindex. The supplied map has the following required fields: 

table: name of the backing table. It can be qualified by the keyspace.
from: list of columns in the table that have the 'from' values of the lookup vindex.
to: The 'to' column name of the table.

The following fields are optional: 

autocommit: setting this to "true" will cause deletes to be ignored.
write_only: in this mode, Map functions return the full keyrange causing a full scatter.

func NewNull 

func NewNull(name string, m map[string]string) (Vindex, error)

NewNull creates a new Null.

func NewNumeric 

func NewNumeric(name string, _ map[string]string) (Vindex, error)

NewNumeric creates a Numeric vindex.

func NewNumericStaticMap 

func NewNumericStaticMap(name string, params map[string]string) (Vindex, error)

NewNumericStaticMap creates a NumericStaticMap vindex.

func NewRegionExperimental 

func NewRegionExperimental(name string, m map[string]string) (Vindex, error)

NewRegionExperimental creates a RegionExperimental vindex. The supplied map requires all the fields of "consistent_lookup_unique". Additionally, it requires a region_bytes argument whose value can be "1", or "2".

func NewRegionJSON 

func NewRegionJSON(name string, m map[string]string) (Vindex, error)

NewRegionJSON creates a RegionJson vindex. The supplied map requires all the fields of "RegionExperimental". Additionally, it requires a region_map argument representing the path to a json file containing a map of country to region.

func NewReverseBits 

func NewReverseBits(name string, m map[string]string) (Vindex, error)

NewReverseBits creates a new ReverseBits.

func NewUnicodeLooseMD5 

func NewUnicodeLooseMD5(name string, _ map[string]string) (Vindex, error)

NewUnicodeLooseMD5 creates a new UnicodeLooseMD5.

func NewUnicodeLooseXXHash added in v0.8.0 

func NewUnicodeLooseXXHash(name string, _ map[string]string) (Vindex, error)

NewUnicodeLooseXXHash creates a new UnicodeLooseXXHash struct.

func NewXXHash 

func NewXXHash(name string, m map[string]string) (Vindex, error)

NewXXHash creates a new XXHash.

type WantOwnerInfo 

type WantOwnerInfo interface {
	SetOwnerInfo(keyspace, table string, cols []sqlparser.ColIdent) error
}

WantOwnerInfo defines the interface that a vindex must satisfy to request info about the owner table. This information can be used to query the owner's table for the owning row's presence.

type XXHash 

type XXHash struct {
	// contains filtered or unexported fields
}

XXHash defines vindex that hashes any sql types to a KeyspaceId by using xxhash64. It's Unique and works on any platform giving identical result.

func (*XXHash) CachedSize added in v0.10.0 

func (cached *XXHash) CachedSize(alloc bool) int64

func (*XXHash) Cost 

func (vind *XXHash) Cost() int

Cost returns the cost of this index as 1.

func (*XXHash) IsUnique 

func (vind *XXHash) IsUnique() bool

IsUnique returns true since the Vindex is unique.

func (*XXHash) Map 

func (vind *XXHash) Map(cursor VCursor, ids []sqltypes.Value) ([]key.Destination, error)

Map can map ids to key.Destination objects.

func (*XXHash) NeedsVCursor 

func (vind *XXHash) NeedsVCursor() bool

NeedsVCursor satisfies the Vindex interface.

func (*XXHash) String 

func (vind *XXHash) String() string

String returns the name of the vindex.

func (*XXHash) Verify 

func (vind *XXHash) Verify(_ VCursor, ids []sqltypes.Value, ksids [][]byte) ([]bool, error)

Verify returns true if ids maps to ksids.

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