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Create a "sort support" interface API for faster sorting.

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This patch creates an API whereby a btree index opclass can optionally
provide non-SQL-callable support functions for sorting.  In the initial
patch, we only use this to provide a directly-callable comparator function,
which can be invoked with a bit less overhead than the traditional
SQL-callable comparator.  While that should be of value in itself, the real
reason for doing this is to provide a datatype-extensible framework for
more aggressive optimizations, as in Peter Geoghegan's recent work.

Robert Haas and Tom Lane
This commit is contained in:
Tom Lane
2011-12-07 00:18:38 -05:00
parent d2a662182e
commit c6e3ac11b6
30 changed files with 869 additions and 421 deletions
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15
src/include/utils/builtins.h
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@ -279,7 +279,7 @@ extern void pg_lltoa(int64 ll, char *a);
/*
* Per-opclass comparison functions for new btrees. These are
* stored in pg_amproc and defined in access/nbtree/nbtcompare.c
* stored in pg_amproc; most are defined in access/nbtree/nbtcompare.c
*/
extern Datum btboolcmp(PG_FUNCTION_ARGS);
extern Datum btint2cmp(PG_FUNCTION_ARGS);
@ -304,6 +304,19 @@ extern Datum btcharcmp(PG_FUNCTION_ARGS);
extern Datum btnamecmp(PG_FUNCTION_ARGS);
extern Datum bttextcmp(PG_FUNCTION_ARGS);
/*
* Per-opclass sort support functions for new btrees. Like the
* functions above, these are stored in pg_amproc; most are defined in
* access/nbtree/nbtcompare.c
*/
extern Datum btint2sortsupport(PG_FUNCTION_ARGS);
extern Datum btint4sortsupport(PG_FUNCTION_ARGS);
extern Datum btint8sortsupport(PG_FUNCTION_ARGS);
extern Datum btfloat4sortsupport(PG_FUNCTION_ARGS);
extern Datum btfloat8sortsupport(PG_FUNCTION_ARGS);
extern Datum btoidsortsupport(PG_FUNCTION_ARGS);
extern Datum btnamesortsupport(PG_FUNCTION_ARGS);
/* float.c */
extern PGDLLIMPORT int extra_float_digits;