Use abbreviated keys for faster sorting of numeric datums.

Andrew Gierth, reviewed by Peter Geoghegan, with further tweaks by me.

src/backend/utils/misc/guc.c

@@ -112,9 +112,6 @@ extern char *temp_tablespaces;
 extern bool ignore_checksum_failure;
 extern bool synchronize_seqscans;
 
-#ifdef TRACE_SORT
-extern bool trace_sort;
-#endif
 #ifdef TRACE_SYNCSCAN
 extern bool trace_syncscan;
 #endif

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201503302
+#define CATALOG_VERSION_NO	201504021
 
 #endif

src/include/catalog/pg_amproc.h

@@ -118,6 +118,7 @@ DATA(insert (	1984   829 829 1 836 ));
 DATA(insert (	1986   19 19 1 359 ));
 DATA(insert (	1986   19 19 2 3135 ));
 DATA(insert (	1988   1700 1700 1 1769 ));
+DATA(insert (	1988   1700 1700 2 3283 ));
 DATA(insert (	1989   26 26 1 356 ));
 DATA(insert (	1989   26 26 2 3134 ));
 DATA(insert (	1991   30 30 1 404 ));

src/include/catalog/pg_proc.h

@@ -2370,6 +2370,8 @@ DATA(insert OID = 1767 ( numeric_larger			PGNSP PGUID 12 1 0 0 0 f f f f t f i 2
 DESCR("larger of two");
 DATA(insert OID = 1769 ( numeric_cmp			PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 23 "1700 1700" _null_ _null_ _null_ _null_ numeric_cmp _null_ _null_ _null_ ));
 DESCR("less-equal-greater");
+DATA(insert OID = 3283 ( numeric_sortsupport	PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2278 "2281" _null_ _null_ _null_ _null_ numeric_sortsupport _null_ _null_ _null_ ));
+DESCR("sort support");
 DATA(insert OID = 1771 ( numeric_uminus			PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 1700 "1700" _null_ _null_ _null_ _null_ numeric_uminus _null_ _null_ _null_ ));
 DATA(insert OID = 1779 ( int8					PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 20 "1700" _null_ _null_ _null_ _null_ numeric_int8 _null_ _null_ _null_ ));
 DESCR("convert numeric to int8");

src/include/utils/builtins.h

@@ -978,6 +978,7 @@ extern Datum numeric_round(PG_FUNCTION_ARGS);
 extern Datum numeric_trunc(PG_FUNCTION_ARGS);
 extern Datum numeric_ceil(PG_FUNCTION_ARGS);
 extern Datum numeric_floor(PG_FUNCTION_ARGS);
+extern Datum numeric_sortsupport(PG_FUNCTION_ARGS);
 extern Datum numeric_cmp(PG_FUNCTION_ARGS);
 extern Datum numeric_eq(PG_FUNCTION_ARGS);
 extern Datum numeric_ne(PG_FUNCTION_ARGS);

src/include/utils/guc.h

@@ -258,6 +258,10 @@ extern int	tcp_keepalives_idle;
 extern int	tcp_keepalives_interval;
 extern int	tcp_keepalives_count;
 
+#ifdef TRACE_SORT
+extern bool trace_sort;
+#endif
+
 /*
  * Functions exported by guc.c
  */