added low used indexes analyze version with replica indexes included

sql/low_used_indexes_with_replica.sql

@@ -0,0 +1,23 @@
+
+SELECT
+        local.schemaname||'.'||local.relname,
+        local.indexrelname,
+        local.idx_scan as local_used,
+	replica.idx_scan as remote_used,
+        (coalesce(n_tup_ins,0)+coalesce(n_tup_upd,0)-coalesce(n_tup_hot_upd,0)+coalesce(n_tup_del,0)) as write_activity,
+        pg_stat_user_tables.seq_scan,
+        pg_stat_user_tables.n_live_tup,
+	pg_size_pretty(pg_relation_size(indexrelid::regclass)) as size
+from pg_stat_user_indexes as local
+join replica_fdw.pg_stat_user_indexes as replica USING (relid, indexrelid)
+join pg_stat_user_tables USING (relid)
+join pg_index USING (indexrelid)
+where
+        pg_index.indisunique is false
+        and 
+	--heuristic between table size, index usage and write actibity)
+	(local.idx_scan+replica.idx_scan)::float*pg_relation_size(relid::regclass)<=10*(coalesce(n_tup_ins,0)+coalesce(n_tup_upd,0)-coalesce(n_tup_hot_upd,0)+coalesce(n_tup_del,0))::float
+	--skip small unused indexes on zero write tables
+	and not ((coalesce(n_tup_ins,0)+coalesce(n_tup_upd,0)-coalesce(n_tup_hot_upd,0)+coalesce(n_tup_del,0))<100000 and pg_relation_size(indexrelid::regclass)<100*1024*1024)
+order by write_activity desc,pg_relation_size(relid::regclass) desc, local.indexrelname
+