Use 128-bit math to accelerate some aggregation functions.

On platforms where we support 128bit integers, use them to implement
faster transition functions for sum(int8), avg(int8),
var_*(int2/int4),stdev_*(int2/int4). Where not supported continue to use
numeric as a transition type.

In some synthetic benchmarks this has been shown to provide significant
speedups.

Bumps catversion.

Discussion: 544BB5F1.50709@proxel.se
Author: Andreas Karlsson
Reviewed-By: Peter Geoghegan, Petr Jelinek, Andres Freund,
    Oskari Saarenmaa, David Rowley

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201503181
+#define CATALOG_VERSION_NO	201503191
 
 #endif

src/include/catalog/pg_proc.h

@@ -2501,6 +2501,8 @@ DATA(insert OID = 3568 (  int4_accum_inv   PGNSP PGUID 12 1 0 0 0 f f f f f f i
 DESCR("aggregate transition function");
 DATA(insert OID = 3569 (  int8_accum_inv   PGNSP PGUID 12 1 0 0 0 f f f f f f i 2 0 2281 "2281 20" _null_ _null_ _null_ _null_ int8_accum_inv _null_ _null_ _null_ ));
 DESCR("aggregate transition function");
+DATA(insert OID = 3387 (  int8_avg_accum_inv   PGNSP PGUID 12 1 0 0 0 f f f f f f i 2 0 2281 "2281 20" _null_ _null_ _null_ _null_ int8_avg_accum_inv _null_ _null_ _null_ ));
+DESCR("aggregate transition function");
 DATA(insert OID = 3178 (  numeric_sum	   PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_sum _null_ _null_ _null_ ));
 DESCR("aggregate final function");
 DATA(insert OID = 1837 (  numeric_avg	   PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_avg _null_ _null_ _null_ ));
@@ -2519,6 +2521,19 @@ DATA(insert OID = 1841 (  int4_sum		   PGNSP PGUID 12 1 0 0 0 f f f f f f i 2 0
 DESCR("aggregate transition function");
 DATA(insert OID = 1842 (  int8_sum		   PGNSP PGUID 12 1 0 0 0 f f f f f f i 2 0 1700 "1700 20" _null_ _null_ _null_ _null_ int8_sum _null_ _null_ _null_ ));
 DESCR("aggregate transition function");
+DATA(insert OID = 3388 (  numeric_poly_sum	   PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_poly_sum _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+DATA(insert OID = 3389 (  numeric_poly_avg	   PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_poly_avg _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+DATA(insert OID = 3390 (  numeric_poly_var_pop  PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_poly_var_pop _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+DATA(insert OID = 3391 (  numeric_poly_var_samp PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_poly_var_samp _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+DATA(insert OID = 3392 (  numeric_poly_stddev_pop PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_	numeric_poly_stddev_pop _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+DATA(insert OID = 3393 (  numeric_poly_stddev_samp	PGNSP PGUID 12 1 0 0 0 f f f f f f i 1 0 1700 "2281" _null_ _null_ _null_ _null_ numeric_poly_stddev_samp _null_ _null_ _null_ ));
+DESCR("aggregate final function");
+
 DATA(insert OID = 1843 (  interval_accum   PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 1187 "1187 1186" _null_ _null_ _null_ _null_ interval_accum _null_ _null_ _null_ ));
 DESCR("aggregate transition function");
 DATA(insert OID = 3549 (  interval_accum_inv   PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 1187 "1187 1186" _null_ _null_ _null_ _null_ interval_accum_inv _null_ _null_ _null_ ));

src/include/utils/builtins.h

@@ -1027,6 +1027,12 @@ extern Datum numeric_var_pop(PG_FUNCTION_ARGS);
 extern Datum numeric_var_samp(PG_FUNCTION_ARGS);
 extern Datum numeric_stddev_pop(PG_FUNCTION_ARGS);
 extern Datum numeric_stddev_samp(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_sum(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_avg(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_var_pop(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_var_samp(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_stddev_pop(PG_FUNCTION_ARGS);
+extern Datum numeric_poly_stddev_samp(PG_FUNCTION_ARGS);
 extern Datum int2_sum(PG_FUNCTION_ARGS);
 extern Datum int4_sum(PG_FUNCTION_ARGS);
 extern Datum int8_sum(PG_FUNCTION_ARGS);
@@ -1034,6 +1040,7 @@ extern Datum int2_avg_accum(PG_FUNCTION_ARGS);
 extern Datum int4_avg_accum(PG_FUNCTION_ARGS);
 extern Datum int2_avg_accum_inv(PG_FUNCTION_ARGS);
 extern Datum int4_avg_accum_inv(PG_FUNCTION_ARGS);
+extern Datum int8_avg_accum_inv(PG_FUNCTION_ARGS);
 extern Datum int8_avg(PG_FUNCTION_ARGS);
 extern Datum int2int4_sum(PG_FUNCTION_ARGS);
 extern Datum width_bucket_numeric(PG_FUNCTION_ARGS);