rows

package module
v1.22.5 Latest Latest
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 Go to latest Published: May 3, 2024 License: Apache-2.0 Imports: 8 Imported by: 0

Documentation

Overview

Copyright 2022 Molecula Corp. (DBA FeatureBase). SPDX-License-Identifier: Apache-2.0

Copyright 2022 Molecula Corp. (DBA FeatureBase). SPDX-License-Identifier: Apache-2.0

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type BSIData added in v1.22.4 

type BSIData []*Row

BSIData contains BSI-structured data.

func AddBSI added in v1.22.4 

func AddBSI(x, y BSIData) BSIData

AddBSI adds two BSI bitmaps together. It does not handle sign and has no concept of overflow.

func (BSIData) PivotDescending added in v1.22.4 

func (bsi BSIData) PivotDescending(filter *Row, branch uint64, limit, offset *uint64, fn func(uint64, ...uint64))

PivotDescending loops over nonzero BSI values in descending order. For each value, the provided function is called with the value and a slice of the associated columns. If limit or offset are not-nil, they will be applied. Applying a limit or offset may modify the pointed-to value.

type BsiBuilder added in v1.22.4 

type BsiBuilder []RowBuilder

BsiBuilder assembles BSI data. It is optimized for the case in which values are generated sequentially.

func (*BsiBuilder) Build added in v1.22.4 

func (b *BsiBuilder) Build() BSIData

Build BSI data. This resets the builder.

func (*BsiBuilder) Insert added in v1.22.4 

func (b *BsiBuilder) Insert(col, val uint64)

Insert a value into the BSI data. Columns must be inserted sequentially, and duplicates are not allowed.

type ColumnInfo 

type ColumnInfo struct {
	Name     string
	DataType DataType
}

type DataType 

type DataType byte
const (
	String DataType = 1 + iota
	Int64
	Float64
	Timestamp
)

type Row 

type Row struct {
	Segments []RowSegment

	// String keys translated to/from segment columns.
	Keys []string

	// Index tells what index this row is from - needed for key translation.
	Index string

	// Field tells what field this row is from if it's a "vertical"
	// row. It may be the result of a Distinct query or Rows
	// query. Knowing the index and field, we can figure out how to
	// interpret the row data.
	Field string

	// NoSplit indicates that this row may not be split.
	// This is used for `Rows` calls in a GroupBy.
	NoSplit bool
}

Row is a set of integers (the associated columns).

func NewRow 

func NewRow(columns ...uint64) *Row

NewRow returns a new instance of Row.

func NewRowFromBitmap 

func NewRowFromBitmap(b *roaring.Bitmap) *Row

NewRowFromBitmap divides a bitmap into rows, which it now calls shards. This transposes; data that was in any shard for Row 0 is now considered shard 0, etcetera.

func NewRowFromRoaring 

func NewRowFromRoaring(data []byte) *Row

NewRowFromRoaring parses a roaring data file as a row, dividing it into bitmaps and rowSegments based on shard width.

func (*Row) Any 

func (r *Row) Any() bool

Any returns true if row contains any bits.

func (*Row) Clone 

func (r *Row) Clone() (clone *Row)

func (*Row) Columns 

func (r *Row) Columns() []uint64

Columns returns the columns in r as a slice of ints.

func (*Row) Count 

func (r *Row) Count() uint64

Count returns the number of columns in the row.

func (*Row) Difference 

func (r *Row) Difference(others ...*Row) *Row

Difference returns the diff of r and other.

func (*Row) Freeze 

func (r *Row) Freeze()

func (*Row) Hash 

func (r *Row) Hash() uint64

Hash calculate checksum code be useful in block hash join

func (*Row) Includes 

func (r *Row) Includes(col uint64) bool

Includes returns true if the row contains the given column.

func (*Row) Intersect 

func (r *Row) Intersect(other *Row) *Row

Intersect returns the itersection of r and other.

func (*Row) IsEmpty 

func (r *Row) IsEmpty() bool

IsEmpty returns true if the row doesn't contain any set bits.

func (*Row) MarshalJSON 

func (r *Row) MarshalJSON() ([]byte, error)

MarshalJSON returns a JSON-encoded byte slice of r.

func (*Row) Merge 

func (r *Row) Merge(other *Row)

Merge merges data from other into r.

func (*Row) Roaring 

func (r *Row) Roaring() []byte

Roaring returns the row treated as a unified roaring bitmap.

func (*Row) SetBit 

func (r *Row) SetBit(i uint64) (changed bool)

SetBit sets the i-th column of the row.

func (*Row) ShardColumns 

func (r *Row) ShardColumns() []int64

func (*Row) Shift 

func (r *Row) Shift(n int64) (*Row, error)

Shift returns the bitwise shift of r by n bits. Currently only positive shift values are supported.

NOTE: the Shift method is currently unsupported, and is considerred to be incorrect. Please DO NOT use it. We are leaving it here in case someone internally wants to use it with the understanding that the results may be incorrect.

Why unsupported? For a full description, see: https://github.com/featurebasedb/pilosa/issues/403. In short, the current implementation will shift a bit at the edge of a shard out of the shard and into a container which is assumed to be an invalid container for the shard. So for example, shifting the last bit of shard 0 (containers 0-15) will shift that bit out to container 16. While this "sort of" works, it breaks an assumption about containers, and might stop working in the future if that assumption is enforced.

func (*Row) ToRows 

func (r *Row) ToRows(callback func(*RowResult) error) error

func (*Row) ToTable 

func (r *Row) ToTable() (*Table, error)

func (*Row) Union 

func (r *Row) Union(others ...*Row) *Row

Union returns the bitwise union of r and other.

func (*Row) Xor 

func (r *Row) Xor(other *Row) *Row

Xor returns the xor of r and other.

type RowBuilder added in v1.22.4 

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

RowBuilder builds a row quickly from individual values. It is optimized for the case in which values are generated sequentially.

func (*RowBuilder) Add added in v1.22.4 

func (b *RowBuilder) Add(v uint64)

Add a value to the bitmap. Values must be added sequentially.

func (*RowBuilder) Build added in v1.22.4 

func (b *RowBuilder) Build() *Row

Build a Row from stored data. This resets the builder.

type RowResult 

type RowResult struct {
	Headers []*ColumnInfo
	Columns []Value
}

type RowSegment 

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

RowSegment holds a subset of a row. This could point to a mmapped roaring bitmap or an in-memory bitmap. The width of the segment will always match the shard width.

func NewSegment added in v1.22.5 

func NewSegment(data *roaring.Bitmap, shard uint64, writable bool) *RowSegment

func (*RowSegment) ClearBit 

func (s *RowSegment) ClearBit(i uint64) (changed bool)

ClearBit clears the i-th column of the row.

func (*RowSegment) Columns 

func (s *RowSegment) Columns() []uint64

Columns returns a list of all columns set in the segment.

func (*RowSegment) Count 

func (s *RowSegment) Count() uint64

Count returns the number of set columns in the row.

func (*RowSegment) Difference 

func (s *RowSegment) Difference(others ...*RowSegment) *RowSegment

Difference returns the diff of s and other.

func (*RowSegment) Freeze 

func (s *RowSegment) Freeze()

func (*RowSegment) Intersect 

func (s *RowSegment) Intersect(other *RowSegment) *RowSegment

Intersect returns the itersection of s and other.

func (*RowSegment) IntersectionCount 

func (s *RowSegment) IntersectionCount(other *RowSegment) uint64

IntersectionCount returns the number of intersections between s and other.

func (*RowSegment) InvalidateCount 

func (s *RowSegment) InvalidateCount()

InvalidateCount updates the cached count in the row.

func (*RowSegment) Merge 

func (s *RowSegment) Merge(other *RowSegment)

Merge adds chunks from other to s. Chunks in s are overwritten if they exist in other.

func (*RowSegment) SetBit 

func (s *RowSegment) SetBit(i uint64) (changed bool)

SetBit sets the i-th column of the row.

func (*RowSegment) Shard 

func (s *RowSegment) Shard() uint64

func (*RowSegment) ShardColumns 

func (s *RowSegment) ShardColumns() []int64

Columns returns a list of all columns set in the segment, normalized from 0-shardwidth-1

func (*RowSegment) Shift 

func (s *RowSegment) Shift() (*RowSegment, error)

Shift returns s shifted by 1 bit.

func (*RowSegment) Union 

func (s *RowSegment) Union(others ...*RowSegment) *RowSegment

Union returns the bitwise union of s and other.

func (*RowSegment) Xor 

func (s *RowSegment) Xor(other *RowSegment) *RowSegment

Xor returns the xor of s and other.

type RowValue 

type RowValue []Value

type Table 

type Table struct {
	Headers []*ColumnInfo
	Rows    []RowValue
}

func RowsToTable 

func RowsToTable(tr ToRowser, n int) (*Table, error)

type ToRowser 

type ToRowser interface {
	ToRows(func(*RowResult) error) error
}

type Value 

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

func IntValue 

func IntValue(v uint64) Value

func StringValue 

func StringValue(s string) Value

func (Value) Float64 

func (v Value) Float64() float64

func (Value) Int 

func (v Value) Int() uint64

func (Value) String 

func (v Value) String() string

func (Value) Time 

func (v Value) Time() time.Time

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