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Revise TupleTableSlot code to avoid unnecessary construction and disassembly

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of tuples when passing data up through multiple plan nodes.  A slot can now
hold either a normal "physical" HeapTuple, or a "virtual" tuple consisting
of Datum/isnull arrays.  Upper plan levels can usually just copy the Datum
arrays, avoiding heap_formtuple() and possible subsequent nocachegetattr()
calls to extract the data again.  This work extends Atsushi Ogawa's earlier
patch, which provided the key idea of adding Datum arrays to TupleTableSlots.
(I believe however that something like this was foreseen way back in Berkeley
days --- see the old comment on ExecProject.)  A test case involving many
levels of join of fairly wide tables (about 80 columns altogether) showed
about 3x overall speedup, though simple queries will probably not be
helped very much.

I have also duplicated some code in heaptuple.c in order to provide versions
of heap_formtuple and friends that use "bool" arrays to indicate null
attributes, instead of the old convention of "char" arrays containing either
'n' or ' '.  This provides a better match to the convention used by
ExecEvalExpr.  While I have not made a concerted effort to get rid of uses
of the old routines, I think they should be deprecated and eventually removed.
This commit is contained in:
Tom Lane
2005-03-16 21:38:10 +00:00
parent 712f053587
commit f97aebd162
44 changed files with 1766 additions and 934 deletions
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21
src/include/access/heapam.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.95 2005/03/14 04:41:13 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.96 2005/03/16 21:38:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -178,27 +178,42 @@ extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf,
Buffer newbuf, HeapTuple newtup);
/* in common/heaptuple.c */
extern Size heap_compute_data_size(TupleDesc tupleDesc,
Datum *values, bool *isnull);
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *values, char *nulls);
extern void heap_fill_tuple(TupleDesc tupleDesc,
Datum *values, bool *isnull,
char *data, uint16 *infomask, bits8 *bit);
extern void DataFill(char *data, TupleDesc tupleDesc,
Datum *values, char *nulls, uint16 *infomask,
bits8 *bit);
extern int heap_attisnull(HeapTuple tup, int attnum);
extern bool heap_attisnull(HeapTuple tup, int attnum);
extern Datum nocachegetattr(HeapTuple tup, int attnum,
TupleDesc att, bool *isnull);
extern Datum heap_getsysattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
bool *isnull);
extern HeapTuple heap_copytuple(HeapTuple tuple);
extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
extern HeapTuple heap_form_tuple(TupleDesc tupleDescriptor,
Datum *values, bool *isnull);
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
Datum *values, char *nulls);
extern HeapTuple heap_modify_tuple(HeapTuple tuple,
TupleDesc tupleDesc,
Datum *replValues,
bool *replIsnull,
bool *doReplace);
extern HeapTuple heap_modifytuple(HeapTuple tuple,
TupleDesc tupleDesc,
Datum *replValues,
char *replNulls,
char *replActions);
extern void heap_deform_tuple(HeapTuple tuple, TupleDesc tupleDesc,
Datum *values, bool *isnull);
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);
extern HeapTuple heap_addheader(int natts, bool withoid,
Size structlen, void *structure);
#endif /* HEAPAM_H */

8
src/include/access/printtup.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/printtup.h,v 1.32 2004/12/31 22:03:21 pgsql Exp $
* $PostgreSQL: pgsql/src/include/access/printtup.h,v 1.33 2005/03/16 21:38:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,13 +23,11 @@ extern void SendRowDescriptionMessage(TupleDesc typeinfo, List *targetlist,
extern void debugStartup(DestReceiver *self, int operation,
TupleDesc typeinfo);
extern void debugtup(HeapTuple tuple, TupleDesc typeinfo,
DestReceiver *self);
extern void debugtup(TupleTableSlot *slot, DestReceiver *self);
/* XXX these are really in executor/spi.c */
extern void spi_dest_startup(DestReceiver *self, int operation,
TupleDesc typeinfo);
extern void spi_printtup(HeapTuple tuple, TupleDesc typeinfo,
DestReceiver *self);
extern void spi_printtup(TupleTableSlot *slot, DestReceiver *self);
#endif /* PRINTTUP_H */