From b23df84af94a4be5c771dd5bdc69385da9225db7 Mon Sep 17 00:00:00 2001
From: Ibrar Ahmed <ibrar.ahmad@gmail.com>
Date: Mon, 12 Oct 2020 17:54:44 +0000
Subject: [PATCH] Issue - (#52): Create a function to return the build version.

Jira: PG-142
---
 pg_stat_monitor--1.0.sql | 12 ++++++++----
 pg_stat_monitor.c        | 14 ++++++++++++++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/pg_stat_monitor--1.0.sql b/pg_stat_monitor--1.0.sql
index c6d2d1f..84b5546 100644
--- a/pg_stat_monitor--1.0.sql
+++ b/pg_stat_monitor--1.0.sql
@@ -9,17 +9,21 @@ RETURNS void
 AS 'MODULE_PATHNAME'
 LANGUAGE C PARALLEL SAFE;
 
+CREATE FUNCTION pg_stat_monitor_version()
+RETURNS text
+AS 'MODULE_PATHNAME'
+LANGUAGE C PARALLEL SAFE;
+
 CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
     OUT bucket              int,
     OUT userid              oid,
     OUT dbid                oid,
     OUT client_ip           bigint,
-	
+
     OUT queryid             text,
     OUT query               text,
     OUT bucket_start_time   timestamptz,
 
-	
 	OUT plan_calls          int8,
     OUT plan_total_time     float8,
     OUT plan_min_time       float8,
@@ -27,7 +31,7 @@ CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
     OUT plan_mean_time      float8,
     OUT plan_stddev_time    float8,
     OUT plan_rows           int8,
-	
+
 	OUT total_calls         int8,
     OUT total_time          float8,
     OUT min_time            float8,
@@ -35,7 +39,7 @@ CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
     OUT mean_time           float8,
     OUT stddev_time         float8,
     OUT affected_rows       int8,
-    
+
 	OUT shared_blks_hit     int8,
     OUT shared_blks_read    int8,
     OUT shared_blks_dirtied int8,
diff --git a/pg_stat_monitor.c b/pg_stat_monitor.c
index 581cdd9..3992280 100644
--- a/pg_stat_monitor.c
+++ b/pg_stat_monitor.c
@@ -16,6 +16,8 @@
 
 PG_MODULE_MAGIC;
 
+#define BUILD_VERSION "0.6.0"
+
 /*---- Initicalization Function Declarations ----*/
 void _PG_init(void);
 void _PG_fini(void);
@@ -45,6 +47,7 @@ static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
 static ProcessUtility_hook_type prev_ProcessUtility = NULL;
 
 
+PG_FUNCTION_INFO_V1(pg_stat_monitor_version);
 PG_FUNCTION_INFO_V1(pg_stat_monitor_reset);
 PG_FUNCTION_INFO_V1(pg_stat_monitor_1_2);
 PG_FUNCTION_INFO_V1(pg_stat_monitor_1_3);
@@ -194,6 +197,17 @@ _PG_fini(void)
 	hash_entry_reset();
 }
 
+/*
+ * Select the version of pg_stat_monitor.
+ */
+Datum
+pg_stat_monitor_version(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_TEXT_P(cstring_to_text(BUILD_VERSION));
+}
+
+#define PG_STAT_STATEMENTS_COLS         38  /* maximum of above */
+
 /*
  * Post-parse-analysis hook: mark query with a queryId
  */