PG-320: Removing the query state code from the view.

The query status monitoring code was used to track the current query state, for example,     
parsing, executing and finishing. After careful review, we have figured out that  
it does not make sense while a lot of time same query is running. Therefore it  
is also consuming resources. This commit will remove that feature. The upgrade
SQL from 1.0 - 2.0 is also updated.

pg_stat_monitor--2.0.sql

@@ -26,19 +26,6 @@ $$ LANGUAGE SQL;
 
 -- Some generic utility function used internally.
 
-CREATE FUNCTION get_state(state_code int8) RETURNS TEXT AS
-$$
-SELECT
-    CASE
-        WHEN state_code = 0 THEN 'PARSING'
-        WHEN state_code = 1 THEN 'PLANNING'
-        WHEN state_code = 2 THEN 'ACTIVE'
-        WHEN state_code = 3 THEN 'FINISHED'
-        WHEN state_code = 4 THEN 'FINISHED WITH ERROR'
-    END
-$$
-LANGUAGE SQL PARALLEL SAFE;
-
 CREATE FUNCTION get_cmd_type (cmd_type INTEGER) RETURNS TEXT AS
 $$
 SELECT
@@ -129,7 +116,6 @@ CREATE FUNCTION pg_stat_monitor_internal(
     OUT planid              text,
     OUT query               text,
     OUT query_plan          text,
-    OUT state_code 			int8,
     OUT top_queryid         text,
     OUT top_query           text,
 	OUT application_name	text,
@@ -233,9 +219,7 @@ CREATE VIEW pg_stat_monitor AS SELECT
 	cpu_sys_time,
     wal_records,
     wal_fpi,
-    wal_bytes,
-	state_code,
-	get_state(state_code) as state
+    wal_bytes
 FROM pg_stat_monitor_internal(TRUE) p, pg_database d  WHERE dbid = oid
 ORDER BY bucket_start_time;
 RETURN 0;
@@ -292,9 +276,6 @@ CREATE VIEW pg_stat_monitor AS SELECT
     wal_records,
     wal_fpi,
     wal_bytes,
-	state_code,
-	get_state(state_code) as state,
-
     -- PostgreSQL-13 Specific Coulumns
     plans_calls
 FROM pg_stat_monitor_internal(TRUE) p, pg_database d  WHERE dbid = oid
@@ -352,8 +333,6 @@ CREATE VIEW pg_stat_monitor AS SELECT
     wal_records,
     wal_fpi,
     wal_bytes,
-	state_code,
-	get_state(state_code) as state,
 
     -- PostgreSQL-14 Specific Columns
     plans_calls,