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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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106
src/backend/access/nbtree/nbtcompare.c
View File

@@ -49,6 +49,7 @@
#include "postgres.h"
#include "utils/builtins.h"
#include "utils/sortsupport.h"
Datum
@@ -69,6 +70,24 @@ btint2cmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32((int32) a - (int32) b);
}
static int
btint2fastcmp(Datum x, Datum y, SortSupport ssup)
{
int16 a = DatumGetInt16(x);
int16 b = DatumGetInt16(y);
return (int) a - (int) b;
}
Datum
btint2sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = btint2fastcmp;
PG_RETURN_VOID();
}
Datum
btint4cmp(PG_FUNCTION_ARGS)
{
@@ -83,6 +102,29 @@ btint4cmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(-1);
}
static int
btint4fastcmp(Datum x, Datum y, SortSupport ssup)
{
int32 a = DatumGetInt32(x);
int32 b = DatumGetInt32(y);
if (a > b)
return 1;
else if (a == b)
return 0;
else
return -1;
}
Datum
btint4sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = btint4fastcmp;
PG_RETURN_VOID();
}
Datum
btint8cmp(PG_FUNCTION_ARGS)
{
@@ -97,6 +139,29 @@ btint8cmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(-1);
}
static int
btint8fastcmp(Datum x, Datum y, SortSupport ssup)
{
int64 a = DatumGetInt64(x);
int64 b = DatumGetInt64(y);
if (a > b)
return 1;
else if (a == b)
return 0;
else
return -1;
}
Datum
btint8sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = btint8fastcmp;
PG_RETURN_VOID();
}
Datum
btint48cmp(PG_FUNCTION_ARGS)
{
@@ -195,6 +260,29 @@ btoidcmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(-1);
}
static int
btoidfastcmp(Datum x, Datum y, SortSupport ssup)
{
Oid a = DatumGetObjectId(x);
Oid b = DatumGetObjectId(y);
if (a > b)
return 1;
else if (a == b)
return 0;
else
return -1;
}
Datum
btoidsortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = btoidfastcmp;
PG_RETURN_VOID();
}
Datum
btoidvectorcmp(PG_FUNCTION_ARGS)
{
@@ -237,3 +325,21 @@ btnamecmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(strncmp(NameStr(*a), NameStr(*b), NAMEDATALEN));
}
static int
btnamefastcmp(Datum x, Datum y, SortSupport ssup)
{
Name a = DatumGetName(x);
Name b = DatumGetName(y);
return strncmp(NameStr(*a), NameStr(*b), NAMEDATALEN);
}
Datum
btnamesortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = btnamefastcmp;
PG_RETURN_VOID();
}