select virtual generated column can't find the column

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t(a int, b int as (a+1), key((a+1)), key(b));
desc format = 'brief' select a+1 from t;

2. What did you expect to see? (Required)

No error

3. What did you see instead (Required)

Can't find column b;

4. What is your TiDB version? (Required)

master

[winoros]

/assign

[winoros]

/unassign

[ti-srebot]

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