database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-25 13:17:41 +03:00
Code Activity

Resurrect heap_deformtuple(), this time implemented as a singly nested

Browse Source 
loop over the fields instead of a loop around heap_getattr.  This is
considerably faster (O(N) instead of O(N^2)) when there are nulls or
varlena fields, since those prevent use of attcacheoff.  Replace loops
over heap_getattr with heap_deformtuple in situations where all or most
of the fields have to be fetched, such as printtup and tuptoaster.
Profiling done more than a year ago shows that this should be a nice
win for situations involving many-column tables.
This commit is contained in:
Tom Lane
2004-06-04 20:35:21 +00:00
parent af44cac6ef
commit 8f2ea8b7b5
8 changed files with 313 additions and 207 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/include/access/heapam.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.89 2004/04/21 18:24:26 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.90 2004/06/04 20:35:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -184,9 +184,9 @@ extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf,
Buffer newbuf, HeapTuple newtup);
/* in common/heaptuple.c */
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *value, char *nulls);
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *values, char *nulls);
extern void DataFill(char *data, TupleDesc tupleDesc,
Datum *value, char *nulls, uint16 *infomask,
Datum *values, char *nulls, uint16 *infomask,
bits8 *bit);
extern int heap_attisnull(HeapTuple tup, int attnum);
extern Datum nocachegetattr(HeapTuple tup, int attnum,
@@ -194,9 +194,14 @@ extern Datum nocachegetattr(HeapTuple tup, int attnum,
extern HeapTuple heap_copytuple(HeapTuple tuple);
extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
Datum *value, char *nulls);
Datum *values, char *nulls);
extern HeapTuple heap_modifytuple(HeapTuple tuple,
Relation relation, Datum *replValue, char *replNull, char *repl);
Relation relation,
Datum *replValues,
char *replNulls,
char *replActions);
extern void heap_deformtuple(HeapTuple tuple, TupleDesc tupleDesc,
Datum *values, char *nulls);
extern void heap_freetuple(HeapTuple tuple);
extern HeapTuple heap_addheader(int natts, bool withoid, Size structlen, void *structure);