tuichenchuxin commented on issue #13571:
URL: 
https://github.com/apache/shardingsphere/issues/13571#issuecomment-966936115


   in pg this sql is not supported
   ```
   SELECT c.oid,
          n.nspname                                                        AS 
schemaname,
          c.relname                                                        AS 
tablename,
          c.relacl,
          pg_get_userbyid(c.relowner)                                      AS 
tableowner,
          obj_description(c.oid)                                           AS 
description,
          c.relkind,
          ci.relname                                                       As 
cluster,
          c.relhasoids                                                     AS 
hasoids,
          c.relhasindex                                                    AS 
hasindexes,
          c.relhasrules                                                    AS 
hasrules,
          t.spcname                                                        AS 
tablespace,
          c.reloptions                                                     AS 
param,
          c.relhastriggers                                                 AS 
hastriggers,
          c.relpersistence                                                 AS 
unlogged,
          ft.ftoptions,
          fs.srvname,
          c.reltuples,
          ((SELECT count(*) FROM pg_inherits WHERE inhparent = c.oid) > 0) AS 
inhtable,
          i2.nspname                                                       AS 
inhschemaname,
          i2.relname                                                       AS 
inhtablename
   FROM pg_class c
            LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
            LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
            LEFT JOIN (pg_inherits i INNER JOIN pg_class c2 ON i.inhparent = 
c2.oid LEFT JOIN pg_namespace n2 ON n2.oid = c2.relnamespace) i2
                      ON i2.inhrelid = c.oid
            LEFT JOIN pg_index ind ON (ind.indrelid = c.oid) and 
(ind.indisclustered = 't')
            LEFT JOIN pg_class ci ON ci.oid = ind.indexrelid
            LEFT JOIN pg_foreign_table ft ON ft.ftrelid = c.oid
            LEFT JOIN pg_foreign_server fs ON ft.ftserver = fs.oid
   WHERE ((c.relkind = 'r'::"char") OR (c.relkind = 'f'::"char"))
     AND n.nspname = 'public'
   ORDER BY schemaname, tablename;
   
   ```


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