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Fix regex, LIKE, and some other second-rank text-manipulation functions

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to not cause needless copying of text datums that have 1-byte headers.
Greg Stark, in response to performance gripe from Guillaume Smet and
ITAGAKI Takahiro.
This commit is contained in:
Tom Lane
2007-09-21 22:52:52 +00:00
parent cc59049daf
commit 7583f9a7ca
6 changed files with 212 additions and 192 deletions
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4
src/include/fmgr.h
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@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.52 2007/07/25 12:22:52 mha Exp $
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.53 2007/09/21 22:52:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -220,6 +220,8 @@ extern struct varlena *pg_detoast_datum_packed(struct varlena * datum);
#define PG_GETARG_RAW_VARLENA_P(n) ((struct varlena *) PG_GETARG_POINTER(n))
/* use this if you want the input datum de-toasted: */
#define PG_GETARG_VARLENA_P(n) PG_DETOAST_DATUM(PG_GETARG_DATUM(n))
/* and this if you can handle 1-byte-header datums: */
#define PG_GETARG_VARLENA_PP(n) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(n))
/* DatumGetFoo macros for varlena types will typically look like this: */
#define DatumGetByteaP(X) ((bytea *) PG_DETOAST_DATUM(X))
#define DatumGetByteaPP(X) ((bytea *) PG_DETOAST_DATUM_PACKED(X))