The RemoveUnusedColumns optimizer traverses the logical operator tree and removes any columns that are not required. More...

Inheritance diagram for duckdb::RemoveUnusedColumns:

[legend]

Collaboration diagram for duckdb::RemoveUnusedColumns:

[legend]

Public Member Functions
	RemoveUnusedColumns (Optimizer &optimizer)

	RemoveUnusedColumns (RemoveUnusedColumns &parent, bool is_root)

void	VisitOperator (LogicalOperator &op) override

Private Member Functions
template<class T >
void	ClearUnusedExpressions (vector< T > &list, idx_t table_idx, bool replace=true)

void	RemoveColumnsFromLogicalGet (LogicalGet &get)

void	CheckPushdownExtract (LogicalOperator &op)

void	RewriteExpressions (LogicalProjection &proj, idx_t expression_count)

void	WritePushdownExtractColumns (const ColumnBinding &binding, ReferencedColumn &col, idx_t original_idx, const LogicalType &column_type, const std::function< idx_t(const ColumnIndex &new_index, optional_ptr< const LogicalType > cast_type)> &callback)

unordered_map< idx_t, MaterializedCTEInfo > &	GetCTEMap ()

optional_ptr< unordered_map< idx_t, MaterializedCTEInfo > >	TryGetCTEMap ()

Private Attributes
Optimizer &	optimizer

Binder &	binder

ClientContext &	context

bool	everything_referenced

RemoveUnusedColumns &	root

unique_ptr< unordered_map< idx_t, MaterializedCTEInfo > >	root_cte_map

Additional Inherited Members
Static Public Member Functions inherited from duckdb::LogicalOperatorVisitor
static void	EnumerateExpressions (LogicalOperator &op, const std::function< void(unique_ptr< Expression > *child)> &callback)

Protected Member Functions inherited from duckdb::BaseColumnPruner
void	VisitExpression (unique_ptr< Expression > *expression) override

unique_ptr< Expression >	VisitReplace (BoundColumnRefExpression &expr, unique_ptr< Expression > *expr_ptr) override

unique_ptr< Expression >	VisitReplace (BoundReferenceExpression &expr, unique_ptr< Expression > *expr_ptr) override

void	AddBinding (BoundColumnRefExpression &col)
	Add a reference to the column in its entirey.

void	AddBinding (BoundColumnRefExpression &col, ColumnIndex child_column)
	Add a reference to a sub-section of the column.

void	AddBinding (BoundColumnRefExpression &col, ColumnIndex child_column, const vector< ReferencedExtractComponent > &parent)
	Add a reference to a sub-section of the column used in a struct extract, with the parent expression.

idx_t	ReplaceBinding (ColumnBinding current_binding, ColumnBinding new_binding)

bool	HandleExtractExpression (unique_ptr< Expression > *expression, optional_ptr< unique_ptr< Expression > > cast_expression=nullptr)

bool	HandleStructExtract (unique_ptr< Expression > &expr, optional_ptr< BoundColumnRefExpression > &colref, reference< ColumnIndex > &path_ref, vector< ReferencedExtractComponent > &expressions)

bool	HandleVariantExtract (unique_ptr< Expression > &expr, optional_ptr< BoundColumnRefExpression > &colref, reference< ColumnIndex > &path_ref, vector< ReferencedExtractComponent > &expressions)

bool	HandleExtractRecursive (unique_ptr< Expression > &expr, optional_ptr< BoundColumnRefExpression > &colref, reference< ColumnIndex > &path_ref, vector< ReferencedExtractComponent > &expressions)

void	SetMode (BaseColumnPrunerMode mode)

BaseColumnPrunerMode	GetMode () const

Protected Member Functions inherited from duckdb::LogicalOperatorVisitor
void	VisitOperatorChildren (LogicalOperator &op)

void	VisitOperatorExpressions (LogicalOperator &op)

void	VisitOperatorWithProjectionMapChildren (LogicalOperator &op)
	Alternatives for VisitOperatorChildren for operators that have a projection map.

void	VisitChildOfOperatorWithProjectionMap (LogicalOperator &child, vector< idx_t > &projection_map)

virtual void	VisitExpressionChildren (Expression &expression)

virtual unique_ptr< Expression >	VisitReplace (BoundAggregateExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundBetweenExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundCaseExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundCastExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundComparisonExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundConjunctionExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundConstantExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundDefaultExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundFunctionExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundOperatorExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundSubqueryExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundParameterExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundWindowExpression &expr, unique_ptr< Expression > *expr_ptr)

virtual unique_ptr< Expression >	VisitReplace (BoundUnnestExpression &expr, unique_ptr< Expression > *expr_ptr)

Protected Attributes inherited from duckdb::BaseColumnPruner
column_binding_map_t< ReferencedColumn >	column_references
	The map of column references.

Detailed Description

The RemoveUnusedColumns optimizer traverses the logical operator tree and removes any columns that are not required.

Member Function Documentation

◆ VisitOperator()

void duckdb::RemoveUnusedColumns::VisitOperator ( LogicalOperator & op )

overridevirtual

Reimplemented from duckdb::LogicalOperatorVisitor.

Member Data Documentation

◆ everything_referenced

bool duckdb::RemoveUnusedColumns::everything_referenced

private

Whether or not all the columns are referenced. This happens in the case of the root expression (because the output implicitly refers all the columns below it)

The documentation for this class was generated from the following file:

external/duckdb/duckdb.cpp

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ VisitOperator()

Member Data Documentation

◆ everything_referenced