diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 5b46f6e7087..ccc5963121e 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.191 2008/10/23 14:34:34 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.192 2008/10/28 22:02:05 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -538,13 +538,29 @@ typedef struct FuncExprState /* * Function manager's lookup info for the target function. If func.fn_oid - * is InvalidOid, we haven't initialized it yet. + * is InvalidOid, we haven't initialized it yet (nor any of the following + * fields). */ FmgrInfo func; /* - * We also need to store argument values across calls when evaluating a - * function-returning-set. + * For a set-returning function (SRF) that returns a tuplestore, we + * keep the tuplestore here and dole out the result rows one at a time. + * The slot holds the row currently being returned. + */ + Tuplestorestate *funcResultStore; + TupleTableSlot *funcResultSlot; + + /* + * In some cases we need to compute a tuple descriptor for the function's + * output. If so, it's stored here. + */ + TupleDesc funcResultDesc; + bool funcReturnsTuple; /* valid when funcResultDesc isn't NULL */ + + /* + * We need to store argument values across calls when evaluating a SRF + * that uses value-per-call mode. * * setArgsValid is true when we are evaluating a set-valued function and * we are in the middle of a call series; we want to pass the same @@ -556,14 +572,15 @@ typedef struct FuncExprState /* * Flag to remember whether we found a set-valued argument to the * function. This causes the function result to be a set as well. Valid - * only when setArgsValid is true. + * only when setArgsValid is true or funcResultStore isn't NULL. */ bool setHasSetArg; /* some argument returns a set */ /* * Flag to remember whether we have registered a shutdown callback for - * this FuncExprState. We do so only if setArgsValid has been true at - * least once (since all the callback is for is to clear setArgsValid). + * this FuncExprState. We do so only if funcResultStore or setArgsValid + * has been set at least once (since all the callback is for is to release + * the tuplestore or clear setArgsValid). */ bool shutdown_reg; /* a shutdown callback is registered */ |