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Diffstat (limited to 'src/backend/executor/execUtils.c')
| -rw-r--r-- | src/backend/executor/execUtils.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/backend/executor/execUtils.c b/src/backend/executor/execUtils.c index 42632cb4d88..ad11392b99d 100644 --- a/src/backend/executor/execUtils.c +++ b/src/backend/executor/execUtils.c @@ -1225,6 +1225,32 @@ ExecGetReturningSlot(EState *estate, ResultRelInfo *relInfo) return relInfo->ri_ReturningSlot; } +/* + * Return the map needed to convert given child result relation's tuples to + * the rowtype of the query's main target ("root") relation. Note that a + * NULL result is valid and means that no conversion is needed. + */ +TupleConversionMap * +ExecGetChildToRootMap(ResultRelInfo *resultRelInfo) +{ + /* If we didn't already do so, compute the map for this child. */ + if (!resultRelInfo->ri_ChildToRootMapValid) + { + ResultRelInfo *rootRelInfo = resultRelInfo->ri_RootResultRelInfo; + + if (rootRelInfo) + resultRelInfo->ri_ChildToRootMap = + convert_tuples_by_name(RelationGetDescr(resultRelInfo->ri_RelationDesc), + RelationGetDescr(rootRelInfo->ri_RelationDesc)); + else /* this isn't a child result rel */ + resultRelInfo->ri_ChildToRootMap = NULL; + + resultRelInfo->ri_ChildToRootMapValid = true; + } + + return resultRelInfo->ri_ChildToRootMap; +} + /* Return a bitmap representing columns being inserted */ Bitmapset * ExecGetInsertedCols(ResultRelInfo *relinfo, EState *estate) |