index column analysis - postgres is OK, still fails for cockroach

plugins/dbgate-plugin-postgres/src/backend/sql/indexes.js

@@ -5,31 +5,25 @@ module.exports = `
         i.relname as "index_name",
         ix.indisprimary as "is_primary",
         ix.indisunique as "is_unique",
-        array_to_string(array_agg(a.attname), '|') as "column_names"
+        ( 
+            select 
+                array_to_string(array_agg((select a.attname from pg_attribute a where ord = a.attnum and a.attrelid = t.oid)), '|')
+            from 
+            unnest(ix.indkey) ord
+        ) as "column_names"
     from
         pg_class t,
         pg_class i,
         pg_index ix,
-        pg_attribute a,
         pg_namespace c
     where
         t.oid = ix.indrelid
         and i.oid = ix.indexrelid
-        and a.attrelid = t.oid
-        and a.attnum = ANY(ix.indkey)
         and t.relkind = 'r'
         and ix.indisprimary = false
         and t.relnamespace = c.oid
         and c.nspname != 'pg_catalog'
         and ('tables:' || c.nspname || '.' ||  t.relname) =OBJECT_ID_CONDITION
-    group by
-        i.oid,
-        t.relname,
-        i.relname,
-        c.nspname,
-        ix.indisprimary,
-        ix.indisunique
     order by
-        t.relname,
-        i.relname
+        t.relname
 `;