diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 1ec14f4a969..9626dbf8b1c 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: execnodes.h,v 1.47 2000/08/22 04:06:22 tgl Exp $ + * $Id: execnodes.h,v 1.48 2000/08/24 03:29:13 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -120,6 +120,31 @@ typedef struct ExprContext List *ecxt_range_table; } ExprContext; +/* + * Set-result status returned by ExecEvalExpr() + */ +typedef enum +{ + ExprSingleResult, /* expression does not return a set */ + ExprMultipleResult, /* this result is an element of a set */ + ExprEndResult /* there are no more elements in the set */ +} ExprDoneCond; + +/* + * 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. + * + * XXX this mechanism is a quick hack and probably needs to be redesigned. + */ +typedef struct ReturnSetInfo +{ + NodeTag type; + ExprDoneCond isDone; +} ReturnSetInfo; + + /* ---------------- * ProjectionInfo node information * |