diff options
| author | Andres Freund | 2017-10-11 23:49:31 +0000 |
|---|---|---|
| committer | Andres Freund | 2017-10-12 00:23:23 +0000 |
| commit | 4c119fbcd49ba882791c7b99a1e934b985468e9f (patch) | |
| tree | 3ab2f089ccdeac4a38e94552b6edf9557b3c7793 /src/include | |
| parent | cff440d368690f94fbda1a475277e90ea2263843 (diff) | |
Improve performance of SendRowDescriptionMessage.
There's three categories of changes leading to better performance:
- Splitting the per-attribute part of SendRowDescriptionMessage into a
v2 and a v3 version allows avoiding branches for every attribute.
- Preallocating the size of the buffer to be big enough for all
attributes and then using pq_write* avoids unnecessary buffer
size checks & resizing.
- Reusing a persistently allocated StringInfo for all
SendRowDescriptionMessage() invocations avoids repeated allocations
& reallocations.
Author: Andres Freund
Discussion: https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/access/printtup.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/include/access/printtup.h b/src/include/access/printtup.h index 641715e416..1b5a003a99 100644 --- a/src/include/access/printtup.h +++ b/src/include/access/printtup.h @@ -20,8 +20,8 @@ extern DestReceiver *printtup_create_DR(CommandDest dest); extern void SetRemoteDestReceiverParams(DestReceiver *self, Portal portal); -extern void SendRowDescriptionMessage(TupleDesc typeinfo, List *targetlist, - int16 *formats); +extern void SendRowDescriptionMessage(StringInfo buf, + TupleDesc typeinfo, List *targetlist, int16 *formats); extern void debugStartup(DestReceiver *self, int operation, TupleDesc typeinfo); |