diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/access/htup_details.h | 7 | ||||
| -rw-r--r-- | src/include/executor/tuptable.h | 20 |
2 files changed, 22 insertions, 5 deletions
diff --git a/src/include/access/htup_details.h b/src/include/access/htup_details.h index 6cd4b95bfdb..aa957cf3b01 100644 --- a/src/include/access/htup_details.h +++ b/src/include/access/htup_details.h @@ -839,11 +839,12 @@ extern void heap_deform_tuple(HeapTuple tuple, TupleDesc tupleDesc, Datum *values, bool *isnull); extern void heap_freetuple(HeapTuple htup); extern MinimalTuple heap_form_minimal_tuple(TupleDesc tupleDescriptor, - const Datum *values, const bool *isnull); + const Datum *values, const bool *isnull, + Size extra); extern void heap_free_minimal_tuple(MinimalTuple mtup); -extern MinimalTuple heap_copy_minimal_tuple(MinimalTuple mtup); +extern MinimalTuple heap_copy_minimal_tuple(MinimalTuple mtup, Size extra); extern HeapTuple heap_tuple_from_minimal_tuple(MinimalTuple mtup); -extern MinimalTuple minimal_tuple_from_heap_tuple(HeapTuple htup); +extern MinimalTuple minimal_tuple_from_heap_tuple(HeapTuple htup, Size extra); extern size_t varsize_any(void *p); extern HeapTuple heap_expand_tuple(HeapTuple sourceTuple, TupleDesc tupleDesc); extern MinimalTuple minimal_expand_tuple(HeapTuple sourceTuple, TupleDesc tupleDesc); diff --git a/src/include/executor/tuptable.h b/src/include/executor/tuptable.h index a044d78e4d0..095e4cc82e3 100644 --- a/src/include/executor/tuptable.h +++ b/src/include/executor/tuptable.h @@ -218,8 +218,12 @@ struct TupleTableSlotOps * meaningful "system columns" in the copy. The copy is not be "owned" by * the slot i.e. the caller has to take responsibility to free memory * consumed by the slot. + * + * The copy has "extra" bytes (maxaligned and zeroed) available before the + * tuple, which is useful so that some callers may store extra data along + * with the minimal tuple without the need for an additional allocation. */ - MinimalTuple (*copy_minimal_tuple) (TupleTableSlot *slot); + MinimalTuple (*copy_minimal_tuple) (TupleTableSlot *slot, Size extra); }; /* @@ -491,7 +495,19 @@ ExecCopySlotHeapTuple(TupleTableSlot *slot) static inline MinimalTuple ExecCopySlotMinimalTuple(TupleTableSlot *slot) { - return slot->tts_ops->copy_minimal_tuple(slot); + return slot->tts_ops->copy_minimal_tuple(slot, 0); +} + +/* + * ExecCopySlotMinimalTupleExtra - return MinimalTuple allocated in caller's + * context, with extra bytes (maxaligned and zeroed) before the tuple for data + * the caller wishes to store along with the tuple (without requiring the + * caller to make an additional allocation). + */ +static inline MinimalTuple +ExecCopySlotMinimalTupleExtra(TupleTableSlot *slot, Size extra) +{ + return slot->tts_ops->copy_minimal_tuple(slot, extra); } /* |