[jira] [Created] (FLINK-21774) Do not display column names when retrun set is emtpy in SQL Client

["Jark Wu (Jira)" <ji...@apache.org>]

Jark Wu created FLINK-21774:
-------------------------------

             Summary: Do not display column names when retrun set is emtpy in SQL Client
                 Key: FLINK-21774
                 URL: https://issues.apache.org/jira/browse/FLINK-21774
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / Client
            Reporter: Jark Wu


Currently, SQL Client will display column names even if the return set is empty:

{code}
SHOW MODULES;
+-------------+
| module name |
+-------------+
0 row in set
!ok
{code}

In mature databases, e.g. MySQL, they only show "Empty Set" instead of column names:

{code}
mysql> show tables;
Empty set (0.00 sec)
{code}

We can improve this by simply omit the column names header. 



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