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Revise executor APIs so that all per-query state structure is built in

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a per-query memory context created by CreateExecutorState --- and destroyed
by FreeExecutorState.  This provides a final solution to the longstanding
problem of memory leaked by various ExecEndNode calls.
This commit is contained in:
Tom Lane
2002-12-15 16:17:59 +00:00
parent 90b3a0b6fd
commit 5bab36e9f6
42 changed files with 806 additions and 547 deletions
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54
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.85 2002/12/14 00:17:59 tgl Exp $
* $Id: execnodes.h,v 1.86 2002/12/15 16:17:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -81,14 +81,14 @@ typedef struct ExprContext_CB
* context.
*
* There are two memory contexts associated with an ExprContext:
* * ecxt_per_query_memory is a relatively long-lived context (such as
* TransactionCommandContext); typically it's the same context the
* ExprContext node itself is allocated in. This context can be
* used for purposes such as storing function call cache info.
* * ecxt_per_query_memory is a query-lifespan context, typically the same
* context the ExprContext node itself is allocated in. This context
* can be used for purposes such as storing function call cache info.
* * ecxt_per_tuple_memory is a short-term context for expression results.
* As the name suggests, it will typically be reset once per tuple,
* before we begin to evaluate expressions for that tuple. Each
* ExprContext normally has its very own per-tuple memory context.
*
* CurrentMemoryContext should be set to ecxt_per_tuple_memory before
* calling ExecEvalExpr() --- see ExecEvalExprSwitchContext().
* ----------------
@ -118,6 +118,9 @@ typedef struct ExprContext
Datum domainValue_datum;
bool domainValue_isNull;
/* Link to containing EState */
struct EState *ecxt_estate;
/* Functions to call back when ExprContext is shut down */
ExprContext_CB *ecxt_callbacks;
} ExprContext;
@ -277,45 +280,43 @@ typedef struct ResultRelInfo
/* ----------------
* EState information
*
* direction direction of the scan
*
* snapshot time qual to use
*
* range_table array of scan relation information
*
* result_relation information for insert/update/delete queries
*
* into_relation_descriptor relation being retrieved "into"
*
* param_list_info information about Param values
*
* tupleTable this is a pointer to an array
* of pointers to tuples used by
* the executor at any given moment.
* Master working state for an Executor invocation
* ----------------
*/
typedef struct EState
{
NodeTag type;
ScanDirection es_direction;
Snapshot es_snapshot;
List *es_range_table;
/* Basic state for all query types: */
ScanDirection es_direction; /* current scan direction */
Snapshot es_snapshot; /* time qual to use */
List *es_range_table; /* List of RangeTableEntrys */
/* Info about target table for insert/update/delete queries: */
ResultRelInfo *es_result_relations; /* array of ResultRelInfos */
int es_num_result_relations; /* length of array */
ResultRelInfo *es_result_relation_info; /* currently active array
* elt */
JunkFilter *es_junkFilter; /* currently active junk filter */
Relation es_into_relation_descriptor;
Relation es_into_relation_descriptor; /* for SELECT INTO */
/* Parameter info: */
ParamListInfo es_param_list_info; /* values of external params */
ParamExecData *es_param_exec_vals; /* values of internal params */
TupleTable es_tupleTable;
/* Other working state: */
MemoryContext es_query_cxt; /* per-query context in which EState lives */
TupleTable es_tupleTable; /* Array of TupleTableSlots */
uint32 es_processed; /* # of tuples processed */
Oid es_lastoid; /* last oid processed (by INSERT) */
List *es_rowMark; /* not good place, but there is no other */
MemoryContext es_query_cxt; /* per-query context in which EState lives */
bool es_instrument; /* true requests runtime instrumentation */
List *es_exprcontexts; /* List of ExprContexts within EState */
/*
* this ExprContext is for per-output-tuple operations, such as
* constraint checks and index-value computations. It will be reset
@ -457,6 +458,7 @@ typedef struct BoolExprState
typedef struct SubPlanState
{
ExprState xprstate;
EState *sub_estate; /* subselect plan has its own EState */
struct PlanState *planstate; /* subselect plan's state tree */
bool needShutdown; /* TRUE = need to shutdown subplan */
HeapTuple curTuple; /* copy of most recent tuple from subplan */