Add contrib sources

Author: Maksim Milyutin

Makefile

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+# contrib/pg_query_state/Makefile
+
+MODULE_big = pg_query_state
+OBJS = pg_query_state.o signal_handler.o $(WIN32RES)
+EXTENSION = pg_query_state
+EXTVERSION = 1.0
+DATA = $(EXTENSION)--$(EXTVERSION).sql
+PGFILEDESC = "pg_query_state - facility to track progress of plan execution"
+
+EXTRA_CLEAN = ./isolation_output
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/pg_query_state
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
+
+check: isolationcheck
+
+ISOLATIONCHECKS=corner_cases
+
+submake-isolation:
+	$(MAKE) -C $(top_builddir)/src/test/isolation all
+
+isolationcheck: | submake-isolation temp-install
+	$(MKDIR_P) isolation_output
+	$(pg_isolation_regress_check) \
+	  --temp-config $(top_srcdir)/contrib/pg_query_state/test.conf \
+      --outputdir=isolation_output \
+	  $(ISOLATIONCHECKS)
+
+isolationcheck-install-force: all | submake-isolation temp-install
+	$(MKDIR_P) isolation_output
+	$(pg_isolation_regress_installcheck) \
+      --outputdir=isolation_output \
+	  $(ISOLATIONCHECKS)
+
+.PHONY: isolationcheck isolationcheck-install-force check
+
+temp-install: EXTRA_INSTALL=contrib/pg_query_state

README.md

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+Parsed test spec with 2 sessions
+
+starting permutation: s1_pg_qs_1
+step s1_pg_qs_1: select pg_query_state(1);
+ERROR:  backend with pid=1 not found
+
+starting permutation: s1_pg_qs_2
+step s1_pg_qs_2: select pg_query_state(pg_backend_pid());
+ERROR:  attempt to extract state of current process
+
+starting permutation: s1_save_pid s2_pg_qs_counterpart
+step s1_save_pid: select save_own_pid(0);
+save_own_pid   
+
+               
+INFO:  state of backend is idle
+step s2_pg_qs_counterpart: select pg_query_state(counterpart_pid(0));
+pg_query_state 
+
+
+starting permutation: s1_save_pid s1_disable_pg_qs s2_pg_qs_counterpart
+step s1_save_pid: select save_own_pid(0);
+save_own_pid   
+
+               
+step s1_disable_pg_qs: set pg_query_state.enable to off;
+INFO:  query execution statistics disabled
+step s2_pg_qs_counterpart: select pg_query_state(counterpart_pid(0));
+pg_query_state 
+
+
+starting permutation: s1_set_bob s2_set_bob s1_save_pid s2_pg_qs_counterpart
+step s1_set_bob: set role bob;
+step s2_set_bob: set role bob;
+step s1_save_pid: select save_own_pid(0);
+save_own_pid   
+
+               
+INFO:  state of backend is idle
+step s2_pg_qs_counterpart: select pg_query_state(counterpart_pid(0));
+pg_query_state 
+
+
+starting permutation: s1_set_bob s2_set_su s1_save_pid s2_pg_qs_counterpart
+step s1_set_bob: set role bob;
+step s2_set_su: set role super;
+step s1_save_pid: select save_own_pid(0);
+save_own_pid   
+
+               
+INFO:  state of backend is idle
+step s2_pg_qs_counterpart: select pg_query_state(counterpart_pid(0));
+pg_query_state 
+
+
+starting permutation: s1_set_bob s2_set_alice s1_save_pid s2_pg_qs_counterpart
+step s1_set_bob: set role bob;
+step s2_set_alice: set role alice;
+step s1_save_pid: select save_own_pid(0);
+save_own_pid   
+
+               
+step s2_pg_qs_counterpart: select pg_query_state(counterpart_pid(0));
+ERROR:  permission denied

expected/corner_cases.out

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+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION pg_query_state" to load this file. \quit
+
+CREATE FUNCTION pg_query_state(pid 		integer
+							 , verbose	boolean = FALSE
+							 , costs 	boolean = FALSE
+							 , timing 	boolean = FALSE
+							 , buffers 	boolean = FALSE
+							 , triggers	boolean = FALSE
+						     , format	text = 'text')
+	RETURNS TABLE (query_text text, plan text)
+	AS 'MODULE_PATHNAME'
+	LANGUAGE C STRICT VOLATILE;
+
+CREATE FUNCTION executor_step(pid integer) RETURNS VOID
+	AS 'MODULE_PATHNAME'
+	LANGUAGE C VOLATILE;
+
+CREATE FUNCTION executor_continue(pid integer) RETURNS VOID
+	AS 'MODULE_PATHNAME'
+	LANGUAGE C VOLATILE;