diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 73 |
1 files changed, 63 insertions, 10 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 97e76ccdfd5..66f93df451d 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: execnodes.h,v 1.67 2001/11/21 22:57:01 tgl Exp $ + * $Id: execnodes.h,v 1.68 2002/05/12 20:10:04 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -53,6 +53,21 @@ typedef struct IndexInfo } IndexInfo; /* ---------------- + * ExprContext_CB + * + * List of callbacks to be called at ExprContext shutdown. + * ---------------- + */ +typedef void (*ExprContextCallbackFunction) (Datum arg); + +typedef struct ExprContext_CB +{ + struct ExprContext_CB *next; + ExprContextCallbackFunction function; + Datum arg; +} ExprContext_CB; + +/* ---------------- * ExprContext * * This class holds the "current context" information @@ -77,20 +92,27 @@ typedef struct IndexInfo */ typedef struct ExprContext { - NodeTag type; + NodeTag type; + /* Tuples that Var nodes in expression may refer to */ TupleTableSlot *ecxt_scantuple; TupleTableSlot *ecxt_innertuple; TupleTableSlot *ecxt_outertuple; + /* Memory contexts for expression evaluation --- see notes above */ - MemoryContext ecxt_per_query_memory; - MemoryContext ecxt_per_tuple_memory; + MemoryContext ecxt_per_query_memory; + MemoryContext ecxt_per_tuple_memory; + /* Values to substitute for Param nodes in expression */ - ParamExecData *ecxt_param_exec_vals; /* for PARAM_EXEC params */ - ParamListInfo ecxt_param_list_info; /* for other param types */ + ParamExecData *ecxt_param_exec_vals; /* for PARAM_EXEC params */ + ParamListInfo ecxt_param_list_info; /* for other param types */ + /* Values to substitute for Aggref nodes in expression */ - Datum *ecxt_aggvalues; /* precomputed values for Aggref nodes */ - bool *ecxt_aggnulls; /* null flags for Aggref nodes */ + Datum *ecxt_aggvalues; /* precomputed values for Aggref nodes */ + bool *ecxt_aggnulls; /* null flags for Aggref nodes */ + + /* Functions to call back when ExprContext is shut down */ + ExprContext_CB *ecxt_callbacks; } ExprContext; /* @@ -107,7 +129,8 @@ typedef enum * When calling a function that might return a set (multiple rows), * a node of this type is passed as fcinfo->resultinfo to allow * return status to be passed back. A function returning set should - * raise an error if no such resultinfo is provided. + * raise an error if no such resultinfo is provided. The ExprContext + * in which the function is being called is also made available. * * XXX this mechanism is a quick hack and probably needs to be redesigned. */ @@ -115,9 +138,9 @@ typedef struct ReturnSetInfo { NodeTag type; ExprDoneCond isDone; + ExprContext *econtext; } ReturnSetInfo; - /* ---------------- * ProjectionInfo node information * @@ -481,6 +504,36 @@ typedef struct SubqueryScanState EState *sss_SubEState; } SubqueryScanState; +/* ---------------- + * FunctionScanState information + * + * Function nodes are used to scan the results of a + * function appearing in FROM (typically a function returning set). + * + * functionmode function operating mode: + * - repeated call + * - materialize + * - return query + * tuplestorestate private state of tuplestore.c + * ---------------- + */ +typedef enum FunctionMode +{ + PM_REPEATEDCALL, + PM_MATERIALIZE, + PM_QUERY +} FunctionMode; + +typedef struct FunctionScanState +{ + CommonScanState csstate; /* its first field is NodeTag */ + FunctionMode functionmode; + TupleDesc tupdesc; + void *tuplestorestate; + Node *funcexpr; /* function expression being evaluated */ + bool returnsTuple; /* does function return tuples? */ +} FunctionScanState; + /* ---------------------------------------------------------------- * Join State Information * ---------------------------------------------------------------- |