semantics

package
v0.17.7 Latest Latest
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 Go to latest Published: May 8, 2024 License: Apache-2.0 Imports: 17 Imported by: 2

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Constants

This section is empty.

Variables

View Source 
var (
	// ErrNotSingleTable refers to an error happening when something should be used only for single tables
	ErrNotSingleTable = vterrors.Errorf(vtrpcpb.Code_INTERNAL, "[BUG] should only be used for single tables")
)

Functions

func GetSubqueryAndOtherSide added in v0.13.0 

func GetSubqueryAndOtherSide(node *sqlparser.ComparisonExpr) (*sqlparser.Subquery, sqlparser.Expr)

GetSubqueryAndOtherSide returns the subquery and other side of a comparison, iff one of the sides is a SubQuery

func RewriteDerivedTableExpression added in v0.15.0 

func RewriteDerivedTableExpression(expr sqlparser.Expr, vt TableInfo) sqlparser.Expr

RewriteDerivedTableExpression rewrites all the ColName instances in the supplied expression with the expressions behind the column definition of the derived table SELECT foo FROM (SELECT id+42 as foo FROM user) as t We need `foo` to be translated to `id+42` on the inside of the derived table

func ValidAsMapKey added in v0.13.0 

func ValidAsMapKey(s sqlparser.SQLNode) bool

Types

type AmbiguousColumnError added in v0.17.0 

type AmbiguousColumnError struct {
	Column string
}

AmbiguousColumnError

func (*AmbiguousColumnError) Error added in v0.17.0 

func (e *AmbiguousColumnError) Error() string

func (*AmbiguousColumnError) ErrorCode added in v0.17.0 

func (e *AmbiguousColumnError) ErrorCode() vtrpcpb.Code

func (*AmbiguousColumnError) ErrorState added in v0.17.0 

func (e *AmbiguousColumnError) ErrorState() vterrors.State

type BuggyError added in v0.17.0 

type BuggyError struct {
	Msg string
}

BuggyError is used for checking conditions that should never occur

func (*BuggyError) Error added in v0.17.0 

func (e *BuggyError) Error() string

type CantUseOptionHereError added in v0.17.0 

type CantUseOptionHereError struct {
	Msg string
}

CantUseOptionHereError

func (*CantUseOptionHereError) Error added in v0.17.0 

func (e *CantUseOptionHereError) Error() string

func (*CantUseOptionHereError) ErrorCode added in v0.17.0 

func (e *CantUseOptionHereError) ErrorCode() vtrpcpb.Code

func (*CantUseOptionHereError) ErrorState added in v0.17.0 

func (e *CantUseOptionHereError) ErrorState() vterrors.State

type ColumnInfo added in v0.12.0 

type ColumnInfo struct {
	Name string
	Type Type
}

ColumnInfo contains information about columns

type ColumnNotFoundError added in v0.17.0 

type ColumnNotFoundError struct {
	Column *sqlparser.ColName
	Table  *sqlparser.TableName
}

ColumnNotFoundError

func (*ColumnNotFoundError) Error added in v0.17.0 

func (e *ColumnNotFoundError) Error() string

func (*ColumnNotFoundError) ErrorCode added in v0.17.0 

func (e *ColumnNotFoundError) ErrorCode() vtrpcpb.Code

func (*ColumnNotFoundError) ErrorState added in v0.17.0 

func (e *ColumnNotFoundError) ErrorState() vterrors.State

type DerivedTable added in v0.13.0 

type DerivedTable struct {
	ASTNode *sqlparser.AliasedTableExpr
	// contains filtered or unexported fields
}

DerivedTable contains the information about the projection, tables involved in derived table.

func (*DerivedTable) GetExpr added in v0.17.0 

func (dt *DerivedTable) GetExpr() *sqlparser.AliasedTableExpr

func (*DerivedTable) GetVindexTable added in v0.13.0 

func (dt *DerivedTable) GetVindexTable() *vindexes.Table

GetVindexTable implements the TableInfo interface

func (*DerivedTable) IsInfSchema added in v0.13.0 

func (dt *DerivedTable) IsInfSchema() bool

IsInfSchema implements the TableInfo interface

func (*DerivedTable) Name added in v0.13.0 

func (dt *DerivedTable) Name() (sqlparser.TableName, error)

Name implements the TableInfo interface

type ExprDependencies added in v0.12.0 

type ExprDependencies map[sqlparser.Expr]TableSet

ExprDependencies stores the tables that an expression depends on as a map

type FakeSI added in v0.11.0 

type FakeSI struct {
	Tables       map[string]*vindexes.Table
	VindexTables map[string]vindexes.Vindex
}

FakeSI is a fake SchemaInformation for testing

func (FakeSI) ConnCollation added in v0.13.0 

func (FakeSI) ConnCollation() collations.ID

func (*FakeSI) FindTableOrVindex added in v0.11.0 

func (s *FakeSI) FindTableOrVindex(tablename sqlparser.TableName) (*vindexes.Table, vindexes.Vindex, string, topodatapb.TabletType, key.Destination, error)

FindTableOrVindex implements the SchemaInformation interface

type JSONTablesError added in v0.17.0 

type JSONTablesError struct {
	Table string
}

JSONTablesError

func (*JSONTablesError) Error added in v0.17.0 

func (e *JSONTablesError) Error() string

type LockOnlyWithDualError added in v0.17.0 

type LockOnlyWithDualError struct {
	Node *sqlparser.LockingFunc
}

LockOnlyWithDualError

func (*LockOnlyWithDualError) Error added in v0.17.0 

func (e *LockOnlyWithDualError) Error() string

func (*LockOnlyWithDualError) ErrorCode added in v0.17.0 

func (e *LockOnlyWithDualError) ErrorCode() vtrpcpb.Code

type MissingInVSchemaError added in v0.17.0 

type MissingInVSchemaError struct {
	Table TableInfo
}

MissingInVSchemaError

func (*MissingInVSchemaError) Error added in v0.17.0 

func (e *MissingInVSchemaError) Error() string

func (*MissingInVSchemaError) ErrorCode added in v0.17.0 

func (e *MissingInVSchemaError) ErrorCode() vtrpcpb.Code

type NextWithMultipleTablesError added in v0.17.0 

type NextWithMultipleTablesError struct {
	CountTables int
}

NextWithMultipleTablesError

func (*NextWithMultipleTablesError) Error added in v0.17.0 

func (e *NextWithMultipleTablesError) Error() string

type NotSequenceTableError added in v0.17.0 

type NotSequenceTableError struct {
	Table string
}

NotSequenceTableError

func (*NotSequenceTableError) Error added in v0.17.0 

func (e *NotSequenceTableError) Error() string

func (*NotSequenceTableError) ErrorCode added in v0.17.0 

func (e *NotSequenceTableError) ErrorCode() vtrpcpb.Code

type ProjError added in v0.12.0 

type ProjError struct {
	Inner error
}

ProjError is used to mark an error as something that should only be returned if the planner fails to merge everything down to a single route

func (ProjError) Error added in v0.12.0 

func (p ProjError) Error() string

type QualifiedOrderInUnionError added in v0.17.0 

type QualifiedOrderInUnionError struct {
	Table string
}

QualifiedOrderInUnionError

func (*QualifiedOrderInUnionError) Error added in v0.17.0 

func (e *QualifiedOrderInUnionError) Error() string

type RealTable added in v0.12.0 

type RealTable struct {
	ASTNode *sqlparser.AliasedTableExpr
	Table   *vindexes.Table
	// contains filtered or unexported fields
}

RealTable contains the alias table expr and vindex table

func (*RealTable) GetExpr added in v0.17.0 

func (r *RealTable) GetExpr() *sqlparser.AliasedTableExpr

GetExpr implements the TableInfo interface

func (*RealTable) GetVindexTable added in v0.12.0 

func (r *RealTable) GetVindexTable() *vindexes.Table

GetVindexTable implements the TableInfo interface

func (*RealTable) IsInfSchema added in v0.12.0 

func (r *RealTable) IsInfSchema() bool

IsInfSchema implements the TableInfo interface

func (*RealTable) Name added in v0.12.0 

func (r *RealTable) Name() (sqlparser.TableName, error)

Name implements the TableInfo interface

type SQLCalcFoundRowsUsageError added in v0.17.0 

type SQLCalcFoundRowsUsageError struct {
}

SQLCalcFoundRowsUsageError

func (*SQLCalcFoundRowsUsageError) Error added in v0.17.0 

func (e *SQLCalcFoundRowsUsageError) Error() string

func (*SQLCalcFoundRowsUsageError) ErrorCode added in v0.17.0 

func (e *SQLCalcFoundRowsUsageError) ErrorCode() vtrpcpb.Code

type SchemaInformation added in v0.11.0 

type SchemaInformation interface {
	FindTableOrVindex(tablename sqlparser.TableName) (*vindexes.Table, vindexes.Vindex, string, topodatapb.TabletType, key.Destination, error)
	ConnCollation() collations.ID
}

SchemaInformation is used tp provide table information from Vschema.

type SemTable 

type SemTable struct {
	// Tables stores information about the tables in the query, including derived tables
	Tables []TableInfo
	// Comments stores any comments of the /* vt+ */ type in the query
	Comments *sqlparser.ParsedComments
	// Warning stores any warnings generated during semantic analysis.
	Warning string
	// Collation represents the default collation for the query, usually inherited
	// from the connection's default collation.
	Collation collations.ID
	// ExprTypes maps expressions to their respective types in the query.
	ExprTypes map[sqlparser.Expr]Type

	// NotSingleRouteErr stores errors related to missing schema information.
	// This typically occurs when a column's existence is uncertain.
	// Instead of failing early, the query is allowed to proceed, possibly
	// succeeding once it reaches MySQL.
	NotSingleRouteErr error

	// NotUnshardedErr stores errors that occur if the query isn't planned as a single route
	// targeting an unsharded keyspace. This typically arises when information is missing, but
	// for unsharded tables, the code operates in a passthrough mode, relying on the underlying
	// MySQL engine to handle errors appropriately.
	NotUnshardedErr error

	// Recursive contains dependencies from the expression to the actual tables
	// in the query (excluding derived tables). For columns in derived tables,
	// this map holds the accumulated dependencies for the column expression.
	Recursive ExprDependencies
	// Direct stores information about the closest dependency for an expression.
	// It doesn't recurse inside derived tables to find the original dependencies.
	Direct ExprDependencies

	// SubqueryMap holds extracted subqueries for each statement.
	SubqueryMap map[sqlparser.Statement][]*sqlparser.ExtractedSubquery
	// SubqueryRef maps subquery pointers to their extracted subquery.
	SubqueryRef map[*sqlparser.Subquery]*sqlparser.ExtractedSubquery

	// ColumnEqualities is used for transitive closures (e.g., if a == b and b == c, then a == c).
	ColumnEqualities map[columnName][]sqlparser.Expr

	// ExpandedColumns is a map of all the added columns for a given table.
	// The columns were added because of the use of `*` in the query
	ExpandedColumns map[sqlparser.TableName][]*sqlparser.ColName
	// contains filtered or unexported fields
}

SemTable contains semantic analysis information about the query.

func Analyze added in v0.11.0 

func Analyze(statement sqlparser.Statement, currentDb string, si SchemaInformation) (*SemTable, error)

Analyze analyzes the parsed query.

func AnalyzeStrict added in v0.17.0 

func AnalyzeStrict(statement sqlparser.Statement, currentDb string, si SchemaInformation) (*SemTable, error)

AnalyzeStrict analyzes the parsed query, and fails the analysis for any possible errors

func EmptySemTable added in v0.13.0 

func EmptySemTable() *SemTable

EmptySemTable creates a new empty SemTable

func (*SemTable) ASTEquals added in v0.16.0 

func (st *SemTable) ASTEquals() *sqlparser.Comparator

ASTEquals returns a sqlparser.Comparator that uses the semantic information in this SemTable to explicitly compare column names for equality.

func (*SemTable) AddColumnEquality added in v0.12.0 

func (st *SemTable) AddColumnEquality(colName *sqlparser.ColName, expr sqlparser.Expr)

AddColumnEquality adds a relation of the given colName to the ColumnEqualities map

func (*SemTable) AddExprs added in v0.11.0 

func (st *SemTable) AddExprs(tbl *sqlparser.AliasedTableExpr, cols sqlparser.SelectExprs)

AddExprs adds new select exprs to the SemTable.

func (*SemTable) AndExpressions added in v0.16.0 

func (st *SemTable) AndExpressions(exprs ...sqlparser.Expr) sqlparser.Expr

AndExpressions ands together two or more expressions, minimising the expr when possible

func (*SemTable) Cloned added in v0.17.0 

func (st *SemTable) Cloned(from, to sqlparser.SQLNode)

Cloned copies the dependencies from one expression into the other

func (*SemTable) ColumnLookup added in v0.13.0 

func (st *SemTable) ColumnLookup(col *sqlparser.ColName) (int, error)

ColumnLookup implements the TranslationLookup interface

func (*SemTable) ContainsExpr added in v0.16.0 

func (st *SemTable) ContainsExpr(e sqlparser.Expr, expres []sqlparser.Expr) bool

func (*SemTable) CopyDependencies added in v0.12.0 

func (st *SemTable) CopyDependencies(from, to sqlparser.Expr)

CopyDependencies copies the dependencies from one expression into the other

func (*SemTable) CopyDependenciesOnSQLNodes added in v0.17.0 

func (st *SemTable) CopyDependenciesOnSQLNodes(from, to sqlparser.SQLNode)

CopyDependenciesOnSQLNodes copies the dependencies from one expression into the other

func (*SemTable) CopyExprInfo added in v0.13.0 

func (st *SemTable) CopyExprInfo(src, dest sqlparser.Expr)

CopyExprInfo lookups src in the ExprTypes map and, if a key is found, assign the corresponding Type value of src to dest.

func (*SemTable) DefaultCollation added in v0.13.0 

func (st *SemTable) DefaultCollation() collations.ID

func (*SemTable) DirectDeps added in v0.12.0 

func (st *SemTable) DirectDeps(expr sqlparser.Expr) TableSet

DirectDeps return the table dependencies of the expression.

func (*SemTable) EqualsExpr added in v0.16.0 

func (st *SemTable) EqualsExpr(a, b sqlparser.Expr) bool

EqualsExpr compares two expressions using the semantic analysis information. This means that we use the binding info to recognize that two ColName's can point to the same table column even though they are written differently. Example would be the `foobar` column in the following query: `SELECT foobar FROM tbl ORDER BY tbl.foobar` The expression in the select list is not equal to the one in the ORDER BY, but they point to the same column and would be considered equal by this method

func (*SemTable) EqualsExprWithDeps added in v0.17.0 

func (st *SemTable) EqualsExprWithDeps(a, b sqlparser.Expr) bool

EqualsExprWithDeps compares two expressions taking into account their semantic information. Dependency data typically pertains only to column expressions, this method considers them for all expression types. The method checks if dependency information exists for both expressions. If it does, the dependencies must match. If we are missing dependency information for either

func (*SemTable) FindSubqueryReference added in v0.13.0 

func (st *SemTable) FindSubqueryReference(subquery *sqlparser.Subquery) *sqlparser.ExtractedSubquery

FindSubqueryReference goes over the sub queries and searches for it by value equality instead of reference equality

func (*SemTable) GetExprAndEqualities added in v0.12.0 

func (st *SemTable) GetExprAndEqualities(expr sqlparser.Expr) []sqlparser.Expr

GetExprAndEqualities returns a slice containing the given expression, and it's known equalities if any

func (*SemTable) GetSubqueryNeedingRewrite added in v0.13.0 

func (st *SemTable) GetSubqueryNeedingRewrite() []*sqlparser.ExtractedSubquery

GetSubqueryNeedingRewrite returns a list of sub-queries that need to be rewritten

func (*SemTable) NeedsWeightString added in v0.14.0 

func (st *SemTable) NeedsWeightString(e sqlparser.Expr) bool

NeedsWeightString returns true if the given expression needs weight_string to do safe comparisons

func (*SemTable) RecursiveDeps added in v0.12.0 

func (st *SemTable) RecursiveDeps(expr sqlparser.Expr) TableSet

RecursiveDeps return the table dependencies of the expression.

func (*SemTable) ReplaceTableSetFor added in v0.13.1 

func (st *SemTable) ReplaceTableSetFor(id TableSet, t *sqlparser.AliasedTableExpr)

ReplaceTableSetFor replaces the given single TabletSet with the new *sqlparser.AliasedTableExpr

func (*SemTable) SingleUnshardedKeyspace added in v0.13.0 

func (st *SemTable) SingleUnshardedKeyspace() (*vindexes.Keyspace, []*vindexes.Table)

SingleUnshardedKeyspace returns the single keyspace if all tables in the query are in the same, unsharded keyspace

func (*SemTable) TableInfoFor added in v0.11.0 

func (st *SemTable) TableInfoFor(id TableSet) (TableInfo, error)

TableInfoFor returns the table info for the table set. It should contains only single table.

func (*SemTable) TableInfoForExpr added in v0.12.0 

func (st *SemTable) TableInfoForExpr(expr sqlparser.Expr) (TableInfo, error)

TableInfoForExpr returns the table info of the table that this expression depends on. Careful: this only works for expressions that have a single table dependency

func (*SemTable) TableSetFor 

func (st *SemTable) TableSetFor(t *sqlparser.AliasedTableExpr) TableSet

TableSetFor returns the bitmask for this particular table

func (*SemTable) TypeForExpr added in v0.17.0 

func (st *SemTable) TypeForExpr(e sqlparser.Expr) (sqltypes.Type, collations.ID, bool)

TypeForExpr returns the type of expressions in the query

type ShardedError added in v0.14.5 

type ShardedError struct {
	Inner error
}

ShardedError is used to mark an error as something that should only be returned if the query is not unsharded

func (ShardedError) Error added in v0.14.5 

func (p ShardedError) Error() string

type TableInfo added in v0.11.0 

type TableInfo interface {
	// Name returns the table name
	Name() (sqlparser.TableName, error)

	// GetVindexTable returns the vschema version of this TableInfo
	GetVindexTable() *vindexes.Table

	// IsInfSchema returns true if this table is information_schema
	IsInfSchema() bool

	// GetExpr returns the AST struct behind this table
	GetExpr() *sqlparser.AliasedTableExpr
	// contains filtered or unexported methods
}

TableInfo contains information about tables

type TableNotUpdatableError added in v0.17.0 

type TableNotUpdatableError struct {
	Table string
}

TableNotUpdatableError

func (*TableNotUpdatableError) Error added in v0.17.0 

func (e *TableNotUpdatableError) Error() string

func (*TableNotUpdatableError) ErrorCode added in v0.17.0 

func (e *TableNotUpdatableError) ErrorCode() vtrpcpb.Code

func (*TableNotUpdatableError) ErrorState added in v0.17.0 

func (e *TableNotUpdatableError) ErrorState() vterrors.State

type TableSet 

type TableSet bitset.Bitset

TableSet is how a set of tables is expressed. Tables get unique bits assigned in the order that they are encountered during semantic analysis.

func EmptyTableSet added in v0.13.0 

func EmptyTableSet() TableSet

EmptyTableSet creates an empty TableSet

func MergeTableSets added in v0.12.0 

func MergeTableSets(tss ...TableSet) TableSet

MergeTableSets merges all the given TableSet into a single one

func SingleTableSet added in v0.12.0 

func SingleTableSet(tableidx int) TableSet

SingleTableSet creates a TableSet that contains only the given table

func TableSetFromIds added in v0.12.0 

func TableSetFromIds(tids ...int) (ts TableSet)

TableSetFromIds returns TableSet for all the id passed in argument.

func (TableSet) Constituents 

func (ts TableSet) Constituents() (result []TableSet)

Constituents returns a slice with the indices for all tables in this TableSet

func (TableSet) ForEachTable added in v0.12.0 

func (ts TableSet) ForEachTable(callback func(int))

ForEachTable calls the given callback with the indices for all tables in this TableSet

func (TableSet) Format added in v0.12.0 

func (ts TableSet) Format(f fmt.State, verb rune)

Format formats the TableSet.

func (TableSet) IsEmpty added in v0.15.1 

func (ts TableSet) IsEmpty() bool

IsEmpty returns true if there are no tables in the tableset

func (TableSet) IsOverlapping 

func (ts TableSet) IsOverlapping(other TableSet) bool

IsOverlapping returns true if at least one table exists in both sets

func (TableSet) IsSolvedBy 

func (ts TableSet) IsSolvedBy(other TableSet) bool

IsSolvedBy returns true if all of `ts` is contained in `other`

func (TableSet) KeepOnly added in v0.13.0 

func (ts TableSet) KeepOnly(other TableSet) TableSet

KeepOnly removes all the tables not in `other` from this TableSet

func (TableSet) Merge 

func (ts TableSet) Merge(other TableSet) TableSet

Merge creates a TableSet that contains both inputs

func (TableSet) NonEmpty added in v0.15.1 

func (ts TableSet) NonEmpty() bool

NonEmpty returns true if there are tables in the tableset

func (TableSet) NumberOfTables 

func (ts TableSet) NumberOfTables() int

NumberOfTables returns the number of bits set

func (TableSet) Remove added in v0.15.1 

func (ts TableSet) Remove(other TableSet) TableSet

Remove returns a new TableSet with all the tables in `other` removed

func (TableSet) TableOffset added in v0.11.0 

func (ts TableSet) TableOffset() int

TableOffset returns the offset in the Tables array from TableSet

func (TableSet) WithTable added in v0.15.1 

func (ts TableSet) WithTable(tableidx int) TableSet

WithTable returns a new TableSet that contains this table too

type Type added in v0.13.0 

type Type struct {
	Type      querypb.Type
	Collation collations.ID
}

Type is the normal querypb.Type with collation

type UnionColumnsDoNotMatchError added in v0.17.0 

type UnionColumnsDoNotMatchError struct {
	FirstProj  int
	SecondProj int
}

UnionColumnsDoNotMatchError

func (*UnionColumnsDoNotMatchError) Error added in v0.17.0 

func (e *UnionColumnsDoNotMatchError) Error() string

func (*UnionColumnsDoNotMatchError) ErrorCode added in v0.17.0 

func (e *UnionColumnsDoNotMatchError) ErrorCode() vtrpcpb.Code

func (*UnionColumnsDoNotMatchError) ErrorState added in v0.17.0 

func (e *UnionColumnsDoNotMatchError) ErrorState() vterrors.State

type UnionWithSQLCalcFoundRowsError added in v0.17.0 

type UnionWithSQLCalcFoundRowsError struct {
}

UnionWithSQLCalcFoundRowsError

func (*UnionWithSQLCalcFoundRowsError) Error added in v0.17.0 

func (e *UnionWithSQLCalcFoundRowsError) Error() string

type UnsupportedConstruct added in v0.17.0 

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

func (*UnsupportedConstruct) Error added in v0.17.0 

func (e *UnsupportedConstruct) Error() string

func (*UnsupportedConstruct) ErrorCode added in v0.17.0 

func (e *UnsupportedConstruct) ErrorCode() vtrpcpb.Code

type UnsupportedMultiTablesInUpdateError added in v0.17.0 

type UnsupportedMultiTablesInUpdateError struct {
	ExprCount int
	NotAlias  bool
}

UnsupportedMultiTablesInUpdateError

func (*UnsupportedMultiTablesInUpdateError) Error added in v0.17.0 

func (e *UnsupportedMultiTablesInUpdateError) Error() string

type UnsupportedNaturalJoinError added in v0.17.0 

type UnsupportedNaturalJoinError struct {
	JoinExpr *sqlparser.JoinTableExpr
}

UnsupportedNaturalJoinError

func (*UnsupportedNaturalJoinError) Error added in v0.17.0 

func (e *UnsupportedNaturalJoinError) Error() string

type VindexTable added in v0.12.0 

type VindexTable struct {
	Table  TableInfo
	Vindex vindexes.Vindex
}

VindexTable contains a vindexes.Vindex and a TableInfo. The former represents the vindex we are keeping information about, and the latter represents the additional table information (usually a RealTable or an AliasedTable) of our vindex.

func (*VindexTable) GetExpr added in v0.17.0 

func (v *VindexTable) GetExpr() *sqlparser.AliasedTableExpr

GetExpr implements the TableInfo interface

func (*VindexTable) GetVindexTable added in v0.12.0 

func (v *VindexTable) GetVindexTable() *vindexes.Table

GetVindexTable implements the TableInfo interface

func (*VindexTable) IsInfSchema added in v0.12.0 

func (v *VindexTable) IsInfSchema() bool

IsInfSchema implements the TableInfo interface

func (*VindexTable) Name added in v0.12.0 

func (v *VindexTable) Name() (sqlparser.TableName, error)

Name implements the TableInfo interface

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