MySQL FDW REL-2_5_5-2

Support JOIN pushdown (LEFT,RIGHT,INNER)
Support direct modification (UPDATE/DELETE)
Support GROUP BY, HAVING clause pushdown
Support Aggregate function pushdown
Support LIMIT OFFSET clause pushdown
Refactored tests
Bug fixings
- Fix crash issue in tlist function pushdown
- Fix unintended behavior by conflicting public function names
- Fix time interval calculation with AVG, SUM, COUNT functions
- Fix BIG_AND/BIT_OR incompatible results

Makefile

@@ -10,7 +10,7 @@ OBJS = connection.o option.o deparse.o mysql_query.o mysql_fdw.o
 EXTENSION = mysql_fdw
 DATA = mysql_fdw--1.0.sql mysql_fdw--1.1.sql mysql_fdw--1.0--1.1.sql
 
-REGRESS = server_options connection_validation dml select pushdown selectfunc
+REGRESS = server_options connection_validation dml select pushdown selectfunc mysql_fdw_post extra/aggregates
 
 MYSQL_CONFIG = mysql_config
 PG_CPPFLAGS := $(shell $(MYSQL_CONFIG) --include)
@@ -51,3 +51,11 @@ include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/contrib/contrib-global.mk
 endif
 
+ifdef REGRESS_PREFIX
+REGRESS_PREFIX_SUB = $(REGRESS_PREFIX)
+else
+REGRESS_PREFIX_SUB = $(VERSION)
+endif
+
+REGRESS := $(addprefix $(REGRESS_PREFIX_SUB)/,$(REGRESS))
+$(shell mkdir -p results/$(REGRESS_PREFIX_SUB)/extra)

README.md

@@ -76,6 +76,19 @@ foreign table. The latest version does the column push-down and only
 brings back the columns that are part of the select target list. This is
 a performance feature.
 
+### GROUP BY, HAVING clause push-down
+The group by, having clause will be pushed-down to the foreign server that reduce the row and column to bring across to PostgreSQL.
+### LIMIT OFFSET clause push-down
+The limit offset clause will be pushed-down to the foreign server that will enhance performance.
+### Aggregation function push-down
+List of aggregate functions push-down:
+```
+avg, bit_and, bit_or, count, json_agg, json_object_agg, max, min, stddev, stddev_pop, stddev_samp, sum, var_pop, var_samp, variance.
+```
+### JOIN clause push-down
+The latest version will push-down the foreign table join clauses (LEFT JOIN, RIGHT JOIN and JOIN_INNER) to
+the foreign server.
+
 ### Prepared Statement
 (Refactoring for `select` queries to use prepared statement)