index column analysingh works for both postgres and cockroach

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

@@ -5,12 +5,8 @@ module.exports = `
         i.relname as "index_name",
         ix.indisprimary as "is_primary",
         ix.indisunique as "is_unique",
-        ( 
-            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"
+        ix.indkey as "indkey",
+        t.oid as "oid"
     from
         pg_class t,
         pg_class i,