tidb 4.0.0 can not show view data_type

[xqwbx163]

create view xxx as select * from xxx;
then show column data_type ，select * from INFORMATION_SCHEMA.columns where table_name=‘v_t_store_refund_info’
the data_type column value is "unspecified"

Release Version: v4.0.0
Edition: Community
Git Commit Hash: 689a6b6
Git Branch: heads/refs/tags/v4.0.0
UTC Build Time: 2020-05-28 01:37:40
GoVersion: go1.13
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false

[beihaiguaishou]

/pick-up

[ti-challenge-bot]

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[beihaiguaishou]

/assign

[ti-srebot]

Please edit this comment or add a new comment to complete the following information

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Bug

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1. Root Cause Analysis (RCA) (optional)

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5. Affected versions

[v3.0.0:v3.0.20],[v4.0.0:v4.0.10],[v5.0.0-rc]

6. Fixed versions

master

[ti-srebot]

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