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Diffstat (limited to 'src/backend/access/common/heaptuple.c')
| -rw-r--r-- | src/backend/access/common/heaptuple.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/backend/access/common/heaptuple.c b/src/backend/access/common/heaptuple.c index a2f67f2332c..c45a48812bf 100644 --- a/src/backend/access/common/heaptuple.c +++ b/src/backend/access/common/heaptuple.c @@ -1367,6 +1367,32 @@ slot_attisnull(TupleTableSlot *slot, int attnum) } /* + * slot_getsysattr + * This function fetches a system attribute of the slot's current tuple. + * Unlike slot_getattr, if the slot does not contain system attributes, + * this will return false (with a NULL attribute value) instead of + * throwing an error. + */ +bool +slot_getsysattr(TupleTableSlot *slot, int attnum, + Datum *value, bool *isnull) +{ + HeapTuple tuple = slot->tts_tuple; + + Assert(attnum < 0); /* else caller error */ + if (tuple == NULL || + tuple == &(slot->tts_minhdr)) + { + /* No physical tuple, or minimal tuple, so fail */ + *value = (Datum) 0; + *isnull = true; + return false; + } + *value = heap_getsysattr(tuple, attnum, slot->tts_tupleDescriptor, isnull); + return true; +} + +/* * heap_freetuple */ void |