Introduce cloudberry_fdw to run queries between one and more CBDB clusters

contrib/cloudberry_fdw/.gitignore

@@ -0,0 +1,5 @@
+# Generated subdirectories
+/log/
+/results/
+/tmp_check/
+link-canary.c

contrib/cloudberry_fdw/Makefile

@@ -0,0 +1,58 @@
+# contrib/cloudberry_fdw/Makefile
+
+MODULE_big = cloudberry_fdw
+OBJS_FRONTEND = \
+	link-canary.o
+
+OBJS = \
+	$(WIN32RES) \
+	$(OBJS_FRONTEND) \
+	connection.o \
+	deparse.o \
+	option.o \
+	cloudberry_fdw.o \
+	shippable.o
+
+PGFILEDESC = "cloudberry_fdw - foreign data wrapper for Cloudberry"
+
+PG_CPPFLAGS = -I$(libpq_srcdir)
+SHLIB_LINK_INTERNAL = -Wl,-Bsymbolic -Wl,-Bstatic -Wl,-Bstatic $(libpq) -Wl,-Bdynamic
+
+EXTENSION = cloudberry_fdw
+DATA = cloudberry_fdw--1.0.sql cloudberry_fdw--1.0--1.1.sql
+
+REGRESS = gp2pg_cloudberry_fdw gp_cloudberry_fdw mpp_cloudberry_fdw #cloudberry_fdw
+REGRESS_OPTS += --init-file=$(top_srcdir)/src/test/regress/init_file
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+SHLIB_PREREQS = submake-libpq
+subdir = contrib/cloudberry_fdw
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
+
+link-canary.c : % : $(top_srcdir)/src/common/%
+	rm -f $@ && $(LN_S) $< .
+
+link-canary.o: link-canary.c
+	$(CC) $(CFLAGS) -DFRONTEND $(CPPFLAGS) -c $< -o $@
+
+clean: clean-symlinks
+
+clean-symlinks:
+	rm -f link-canary.c
+
+# For cloudberry_fdw test
+export PG_PORT=5432
+installcheck: install prep_postgres
+clean: clean_postgres
+prep_postgres:
+	./postgres_setup.bash
+clean_postgres:
+	./postgres_clean.bash
+.PHONY: prep_postgres clean_postgres

contrib/cloudberry_fdw/cloudberry_fdw--1.0--1.1.sql

@@ -0,0 +1,20 @@
+/* contrib/cloudberry_fdw/cloudberry_fdw--1.0--1.1.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION cloudberry_fdw UPDATE TO '1.1'" to load this file. \quit
+
+CREATE FUNCTION cloudberry_fdw_get_connections (OUT server_name text,
+    OUT valid boolean)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME'
+LANGUAGE C STRICT PARALLEL RESTRICTED;
+
+CREATE FUNCTION cloudberry_fdw_disconnect (text)
+RETURNS bool
+AS 'MODULE_PATHNAME'
+LANGUAGE C STRICT PARALLEL RESTRICTED;
+
+CREATE FUNCTION cloudberry_fdw_disconnect_all ()
+RETURNS bool
+AS 'MODULE_PATHNAME'
+LANGUAGE C STRICT PARALLEL RESTRICTED;

contrib/cloudberry_fdw/cloudberry_fdw--1.0.sql

@@ -0,0 +1,18 @@
+/* contrib/cloudberry_fdw/cloudberry_fdw--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION cloudberry_fdw" to load this file. \quit
+
+CREATE FUNCTION cloudberry_fdw_handler()
+RETURNS fdw_handler
+AS 'MODULE_PATHNAME'
+LANGUAGE C STRICT;
+
+CREATE FUNCTION cloudberry_fdw_validator(text[], oid)
+RETURNS void
+AS 'MODULE_PATHNAME'
+LANGUAGE C STRICT;
+
+CREATE FOREIGN DATA WRAPPER cloudberry_fdw
+  HANDLER cloudberry_fdw_handler
+  VALIDATOR cloudberry_fdw_validator;