improve test

Author: jeewonhh

test/sql/catalog/test_querying_from_detached_catalog.test

@@ -11,7 +11,10 @@ statement ok con1
 ATTACH ':memory:' AS db2;
 
 statement ok con1
-CREATE TABLE db2.tbl AS SELECT 1 AS a;
+CREATE TABLE db2.tbl (i INTEGER, j INTEGER);
+
+statement ok con1
+INSERT INTO db2.tbl VALUES (1, 2), (3,4);
 
 statement ok con1
 USE db1;
@@ -28,19 +31,25 @@ USE db2;
 statement ok con2
 DETACH db1;
 
-# querying to an attached catalog should work
-statement ok con1
+# querying to an attached catalog should work (with non-fully qualified name)
+query II con1
 FROM db2.tbl;
+----
+1	2
+3	4
 
 # querying to an attached catalog should work (with fully qualified name)
-statement ok con1
+query II con1
 FROM db2.main.tbl;
+----
+1	2
+3	4
 
-# should give a sensible error message
+# error message should say that the table does not exist
 statement error con1
 FROM db2.non_existent_table;
 ----
-Binder Error: Table "non_existent_table" does not exist!
+Catalog Error: Table with name non_existent_table does not exist!
 
 # querying within the detached catalog fails
 statement error con1