Use a better error message for some error in window function.

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error.

SELECT i, j, SUM(i+j) OVER (ORDER BY jj DESC ROWS UNBOUNDED PRECEDING) foo FROM t;

jj is a column name from table t.

2. What did you expect to see?

Unknown column 'jj' in 'window order by'

3. What did you see instead?

Unknown column 'jj' in 'field list'

4. What version of TiDB are you using (tidb-server -V or run select tidb_version(); on TiDB)?