diff options
Diffstat (limited to 'src/include/executor/executor.h')
| -rw-r--r-- | src/include/executor/executor.h | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h index d12e3f451d2..0d2ffabda68 100644 --- a/src/include/executor/executor.h +++ b/src/include/executor/executor.h @@ -380,6 +380,34 @@ ExecEvalExpr(ExprState *state, #endif /* + * ExecEvalExprNoReturn + * + * Like ExecEvalExpr(), but for cases where no return value is expected, + * because the side-effects of expression evaluation are what's desired. This + * is e.g. used for projection and aggregate transition computation. + + * Evaluate expression identified by "state" in the execution context + * given by "econtext". + * + * The caller should already have switched into the temporary memory context + * econtext->ecxt_per_tuple_memory. The convenience entry point + * ExecEvalExprNoReturnSwitchContext() is provided for callers who don't + * prefer to do the switch in an outer loop. + */ +#ifndef FRONTEND +static inline void +ExecEvalExprNoReturn(ExprState *state, + ExprContext *econtext) +{ + PG_USED_FOR_ASSERTS_ONLY Datum retDatum; + + retDatum = state->evalfunc(state, econtext, NULL); + + Assert(retDatum == (Datum) 0); +} +#endif + +/* * ExecEvalExprSwitchContext * * Same as ExecEvalExpr, but get into the right allocation context explicitly. @@ -401,6 +429,25 @@ ExecEvalExprSwitchContext(ExprState *state, #endif /* + * ExecEvalExprNoReturnSwitchContext + * + * Same as ExecEvalExprNoReturn, but get into the right allocation context + * explicitly. + */ +#ifndef FRONTEND +static inline void +ExecEvalExprNoReturnSwitchContext(ExprState *state, + ExprContext *econtext) +{ + MemoryContext oldContext; + + oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory); + ExecEvalExprNoReturn(state, econtext); + MemoryContextSwitchTo(oldContext); +} +#endif + +/* * ExecProject * * Projects a tuple based on projection info and stores it in the slot passed @@ -419,7 +466,6 @@ ExecProject(ProjectionInfo *projInfo) ExprContext *econtext = projInfo->pi_exprContext; ExprState *state = &projInfo->pi_state; TupleTableSlot *slot = state->resultslot; - bool isnull; /* * Clear any former contents of the result slot. This makes it safe for @@ -427,8 +473,8 @@ ExecProject(ProjectionInfo *projInfo) */ ExecClearTuple(slot); - /* Run the expression, discarding scalar result from the last column. */ - (void) ExecEvalExprSwitchContext(state, econtext, &isnull); + /* Run the expression */ + ExecEvalExprNoReturnSwitchContext(state, econtext); /* * Successfully formed a result row. Mark the result slot as containing a |