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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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30
src/bin/pg_dump/pg_dump.c
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@@ -9892,6 +9892,8 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
int i_sortfamilynsp;
int i_amprocnum;
int i_amproc;
int i_amproclefttype;
int i_amprocrighttype;
char *opcintype;
char *opckeytype;
char *opcdefault;
@@ -9906,6 +9908,8 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
char *sortfamilynsp;
char *amprocnum;
char *amproc;
char *amproclefttype;
char *amprocrighttype;
bool needComma;
int i;
@@ -10150,13 +10154,21 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
*
* Print only those opfamily members that are tied to the opclass by
* pg_depend entries.
*
* We print the amproclefttype/amprocrighttype even though in most cases
* the backend could deduce the right values, because of the corner case
* of a btree sort support function for a cross-type comparison. That's
* only allowed in 9.2 and later, but for simplicity print them in all
* versions that have the columns.
*/
resetPQExpBuffer(query);
if (g_fout->remoteVersion >= 80300)
{
appendPQExpBuffer(query, "SELECT amprocnum, "
"amproc::pg_catalog.regprocedure "
"amproc::pg_catalog.regprocedure, "
"amproclefttype::pg_catalog.regtype, "
"amprocrighttype::pg_catalog.regtype "
"FROM pg_catalog.pg_amproc ap, pg_catalog.pg_depend "
"WHERE refclassid = 'pg_catalog.pg_opclass'::pg_catalog.regclass "
"AND refobjid = '%u'::pg_catalog.oid "
@@ -10168,7 +10180,9 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
else
{
appendPQExpBuffer(query, "SELECT amprocnum, "
"amproc::pg_catalog.regprocedure "
"amproc::pg_catalog.regprocedure, "
"'' AS amproclefttype, "
"'' AS amprocrighttype "
"FROM pg_catalog.pg_amproc "
"WHERE amopclaid = '%u'::pg_catalog.oid "
"ORDER BY amprocnum",
@@ -10182,17 +10196,25 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
i_amprocnum = PQfnumber(res, "amprocnum");
i_amproc = PQfnumber(res, "amproc");
i_amproclefttype = PQfnumber(res, "amproclefttype");
i_amprocrighttype = PQfnumber(res, "amprocrighttype");
for (i = 0; i < ntups; i++)
{
amprocnum = PQgetvalue(res, i, i_amprocnum);
amproc = PQgetvalue(res, i, i_amproc);
amproclefttype = PQgetvalue(res, i, i_amproclefttype);
amprocrighttype = PQgetvalue(res, i, i_amprocrighttype);
if (needComma)
appendPQExpBuffer(q, " ,\n ");
appendPQExpBuffer(q, "FUNCTION %s %s",
amprocnum, amproc);
appendPQExpBuffer(q, "FUNCTION %s", amprocnum);
if (*amproclefttype && *amprocrighttype)
appendPQExpBuffer(q, " (%s, %s)", amproclefttype, amprocrighttype);
appendPQExpBuffer(q, " %s", amproc);
needComma = true;
}