PG-160: Integration with PGXN.

META.json

@@ -0,0 +1,46 @@
+{
+   "name": "pg_stat_monitor",
+   "abstract": "PostgreSQL Query Performance Monitoring Tool",
+   "description": "The pg_stat_monitor is a PostgreSQL Query Performance Monitoring tool, based on PostgreSQL's contrib module pg_stat_statements. PostgreSQL’s pg_stat_statements provides the basic statistics, which is sometimes not enough. The major shortcoming in pg_stat_statements is that it accumulates all the queries and their statistics and does not provide aggregated statistics nor histogram information. In this case, a user needs to calculate the aggregate which is quite expensive.",
+   "version": "0.7.1",
+   "maintainer": [
+      "ibrar.ahmed@percona.com"
+   ],
+   "license": "postgresql",
+   "provides": {
+      "pg_stat_monitor": {
+         "abstract": "PostgreSQL Query Performance Monitoring Tool",
+         "file": "pg_stat_monitor--1.0.sql",
+         "docfile": "README.md",
+         "version": "0.7.1"
+      }
+   },
+   "prereqs": {
+      "runtime": {
+         "requires": {
+            "PostgreSQL": "11.0.0"
+         }
+      }
+   },
+   "resources": {
+      "bugtracker": {
+         "web": "https://jira.percona.com/projects/PG/issues"
+      },
+      "repository": {
+        "url":  "https://github.com/percona/pg_stat_monitor.git",
+        "web":  "https://github.com/percona/pg_stat_monitor",
+        "type": "git"
+      }
+   },
+   "generated_by": "ibrar.ahmed@percona.com",
+   "meta-spec": {
+      "version": "1.0.0",
+      "url": "http://pgxn.org/meta/spec.txt"
+   },
+   "tags": [
+      "monitoring",
+      "statistics-collector",
+      "statistics"
+   ]
+}
+

pg_stat_monitor.c

@@ -1196,6 +1196,8 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 		values[i++] = CStringGetTextDatum(pgss->bucket_start_time[entry->key.bucket_id]);
 		for (kind = 0; kind < PGSS_NUMKIND; kind++)
 		{
+			if (tmp.calls[kind].calls == 0)
+				tmp.calls[kind].calls++;
 			values[i++] = Int64GetDatumFast(tmp.calls[kind].calls);
 			values[i++] = Float8GetDatumFast(tmp.time[kind].total_time);
 			values[i++] = Float8GetDatumFast(tmp.time[kind].min_time);