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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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19
src/backend/utils/adt/timestamp.c
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@ -1830,6 +1830,25 @@ timestamp_cmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(timestamp_cmp_internal(dt1, dt2));
}
/* note: this is used for timestamptz also */
static int
timestamp_fastcmp(Datum x, Datum y, SortSupport ssup)
{
Timestamp a = DatumGetTimestamp(x);
Timestamp b = DatumGetTimestamp(y);
return timestamp_cmp_internal(a, b);
}
Datum
timestamp_sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = timestamp_fastcmp;
PG_RETURN_VOID();
}
Datum
timestamp_hash(PG_FUNCTION_ARGS)
{