pingcap/tidb

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

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#8,190 建立於 2018年11月6日

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描述

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);
  1. 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)
  1. What did you see instead?
tidb> select 1 as a,(select a union select a);
ERROR 1054 (42S22): Unknown column 'a' in 'field list'
  1. 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)

SIG slack channel

#sig-exec

Score

300

Mentor

  • @lzmhhh123

貢獻者指南

技術棧
gosql
領域
backenddatabase
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
blocked
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
SQL subqueriesTiDB execution engine basicsGo programming language
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
50
研究方向
Investigate how TiDB resolves columns in subqueries within SELECT clauses. Look at the expression evaluator and planner code, particularly around column resolution for correlated subqueries. Check if the issue is in the planner building the wrong plan or the executor failing to find the column. The mentor @lzmhhh123 can provide guidance on relevant files.