#include <sort-exec-exprs.h>

Collaboration diagram for impala::SortExecExprs:

Public Member Functions
Status	Init (const TSortInfo &sort_info, ObjectPool *pool)
	Initialize the expressions from a TSortInfo using the specified pool. More...

Status	Init (const std::vector< TExpr > &ordering_exprs, const std::vector< TExpr > sort_tuple_slot_exprs, ObjectPool pool)

Status	Prepare (RuntimeState state, const RowDescriptor &child_row_desc, const RowDescriptor &output_row_desc, MemTracker expr_mem_tracker)
	Prepare all expressions used for sorting and tuple materialization. More...

Status	Open (RuntimeState *state)
	Open all expressions used for sorting and tuple materialization. More...

void	Close (RuntimeState *state)
	Close all expressions used for sorting and tuple materialization. More...

const std::vector< ExprContext * > &	sort_tuple_slot_expr_ctxs () const

const std::vector< ExprContext * > &	lhs_ordering_expr_ctxs () const
	Can only be used after calling Prepare() More...

const std::vector< ExprContext * > &	rhs_ordering_expr_ctxs () const
	Can only be used after calling Open() More...

Private Attributes
std::vector< ExprContext * >	lhs_ordering_expr_ctxs_
	Create two ExprContexts for evaluating over the TupleRows. More...

std::vector< ExprContext * >	rhs_ordering_expr_ctxs_

bool	materialize_tuple_

std::vector< ExprContext * >	sort_tuple_slot_expr_ctxs_

Detailed Description

Helper class to Prepare() , Open() and Close() the ordering expressions used to perform comparisons in a sort. Used by TopNNode, SortNode, and MergingExchangeNode. When two rows are compared, the ordering expressions are evaluated once for each side. TopN and Sort materialize input rows into a single tuple before sorting. If materialize_tuple_ is true, SortExecExprs also stores the slot expressions used to materialize the sort tuples.

Definition at line 29 of file sort-exec-exprs.h.

Member Function Documentation

void impala::SortExecExprs::Close ( RuntimeState * state )

Close all expressions used for sorting and tuple materialization.

Definition at line 62 of file sort-exec-exprs.cc.

References impala::Expr::Close(), lhs_ordering_expr_ctxs_, materialize_tuple_, rhs_ordering_expr_ctxs_, and sort_tuple_slot_expr_ctxs_.

Referenced by impala::SortNode::Close(), impala::TopNNode::Close(), and impala::ExchangeNode::Close().

Status impala::SortExecExprs::Init	(	const TSortInfo &	sort_info,
		ObjectPool *	pool
	)

Initialize the expressions from a TSortInfo using the specified pool.

Definition at line 21 of file sort-exec-exprs.cc.

Referenced by impala::SortNode::Init(), impala::TopNNode::Init(), and impala::ExchangeNode::Init().

Status impala::SortExecExprs::Init	(	const std::vector< TExpr > &	ordering_exprs,
		const std::vector< TExpr > *	sort_tuple_slot_exprs,
		ObjectPool *	pool
	)

Initialize the ordering and (optionally) materialization expressions from the thrift TExprs into the specified pool. sort_tuple_slot_exprs is NULL if the tuple is not materialized.

const std::vector<ExprContext*>& impala::SortExecExprs::lhs_ordering_expr_ctxs ( ) const

inline

Can only be used after calling Prepare()

Definition at line 55 of file sort-exec-exprs.h.

References lhs_ordering_expr_ctxs_.

Referenced by impala::ExecNode::AddExprCtxsToFree(), impala::SortNode::DebugString(), impala::TopNNode::DebugString(), impala::SortNode::Open(), impala::TopNNode::Open(), and impala::ExchangeNode::Open().

Status impala::SortExecExprs::Open ( RuntimeState * state )

Open all expressions used for sorting and tuple materialization.

Definition at line 53 of file sort-exec-exprs.cc.

References impala::Expr::Clone(), lhs_ordering_expr_ctxs_, materialize_tuple_, impala::Status::OK, impala::Expr::Open(), RETURN_IF_ERROR, rhs_ordering_expr_ctxs_, and sort_tuple_slot_expr_ctxs_.

Referenced by impala::SortNode::Open(), impala::TopNNode::Open(), and impala::ExchangeNode::Open().

Status impala::SortExecExprs::Prepare	(	RuntimeState *	state,
		const RowDescriptor &	child_row_desc,
		const RowDescriptor &	output_row_desc,
		MemTracker *	expr_mem_tracker
	)

Prepare all expressions used for sorting and tuple materialization.

Definition at line 42 of file sort-exec-exprs.cc.

References lhs_ordering_expr_ctxs_, materialize_tuple_, impala::Status::OK, impala::Expr::Prepare(), RETURN_IF_ERROR, and sort_tuple_slot_expr_ctxs_.

Referenced by impala::SortNode::Prepare(), impala::TopNNode::Prepare(), and impala::ExchangeNode::Prepare().

const std::vector<ExprContext*>& impala::SortExecExprs::rhs_ordering_expr_ctxs ( ) const

inline

Can only be used after calling Open()

Definition at line 59 of file sort-exec-exprs.h.

References rhs_ordering_expr_ctxs_.

Referenced by impala::ExecNode::AddExprCtxsToFree(), impala::SortNode::Open(), impala::TopNNode::Open(), and impala::ExchangeNode::Open().

const std::vector<ExprContext*>& impala::SortExecExprs::sort_tuple_slot_expr_ctxs ( ) const

inline

Definition at line 50 of file sort-exec-exprs.h.

References sort_tuple_slot_expr_ctxs_.

Referenced by impala::ExecNode::AddExprCtxsToFree(), impala::TopNNode::InsertTupleRow(), and impala::SortNode::Open().

Member Data Documentation

std::vector<ExprContext*> impala::SortExecExprs::lhs_ordering_expr_ctxs_

private

Create two ExprContexts for evaluating over the TupleRows.

Definition at line 65 of file sort-exec-exprs.h.

Referenced by Close(), lhs_ordering_expr_ctxs(), Open(), and Prepare().

bool impala::SortExecExprs::materialize_tuple_

private

If true, the tuples to be sorted are materialized by sort_tuple_slot_exprs_ before the actual sort is performed.

Definition at line 70 of file sort-exec-exprs.h.

Referenced by Close(), Open(), and Prepare().

std::vector<ExprContext*> impala::SortExecExprs::rhs_ordering_expr_ctxs_

private

Definition at line 66 of file sort-exec-exprs.h.

Referenced by Close(), Open(), and rhs_ordering_expr_ctxs().

std::vector<ExprContext*> impala::SortExecExprs::sort_tuple_slot_expr_ctxs_

private

Expressions used to materialize slots in the tuples to be sorted. One expr per slot in the materialized tuple. Valid only if materialize_tuple_ is true.

Definition at line 75 of file sort-exec-exprs.h.

Referenced by Close(), Open(), Prepare(), and sort_tuple_slot_expr_ctxs().

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

be/src/exec/sort-exec-exprs.h
be/src/exec/sort-exec-exprs.cc

Public Member Functions

Private Attributes

Detailed Description

Member Function Documentation

Member Data Documentation