diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 54 |
1 files changed, 28 insertions, 26 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index f8e1f7cc4c9..65c5f23884d 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -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 */ |