Error 1054: Unknown column 'a' in 'field list'

Description

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

select 1 as a,(select a union select a);

2. What did you expect to see?

mysql> select 1 as a,(select a union select a);
+---+---------------------------+
| a | (select a union select a) |
+---+---------------------------+
| 1 |                         1 |
+---+---------------------------+
1 row in set (0.00 sec)

3. What did you see instead?

tidb> select 1 as a,(select a union select a);
ERROR 1054 (42S22): Unknown column 'a' in 'field list'

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

tidb> select tidb_version();                                                        +------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                                                                                     |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v2.1.0-rc.3-147-g379ee5b19
Git Commit Hash: 379ee5b1915a37d14e45230acf4d911c6b80d07d
Git Branch: master
UTC Build Time: 2018-11-06 03:12:11
GoVersion: go version go1.11 darwin/amd64
Race Enabled: false
TiKV Min Version: 2.1.0-alpha.1-ff3dd160846b7d1aed9079c389fc188f7f5ea13e
Check Table Before Drop: false |
+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

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#sig-exec

Score

300

Mentor

• @lzmhhh123