fix: updated Invalid Indexes query

Author: cuprumtan

mamonsu/plugins/pgsql/databases.py

@@ -17,10 +17,10 @@ class Databases(Plugin):
                  " datistemplate = false and datname = :'p1';"
     query_age = "select age(datfrozenxid) from pg_catalog.pg_database where datistemplate = false " \
                 "and datname = :'p1';"
-    query_invalid_indexes = "SELECT count(*) " \
-                            "FROM pg_catalog.pg_index " \
-                            "WHERE pg_catalog.pg_index.indisvalid = false " \
-                            "AND pg_catalog.pg_index.indexrelid NOT IN (SELECT DISTINCT relation FROM pg_catalog.pg_locks WHERE relation IS NOT NULL);"
+    query_invalid_indexes = "SELECT count (*) " \
+                            "FROM pg_catalog.pg_index i LEFT JOIN pg_catalog.pg_locks l " \
+                            "ON (i.indexrelid = l.relation) " \
+                            "WHERE i.indisvalid = false AND l.relation IS NULL;"
 
     # queries for zabbix agent
     query_agent_discovery = "SELECT json_build_object ('data',json_agg(json_build_object('{#DATABASE}',d.datname)))" \