privilege: fix user change after show grants and add user existed check for show grants (#19568)
#19587
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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September 2, 2020 15:57
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cherry-pick #19568 to release-3.0
What problem does this PR solve?
Issue Number: close #18878
Problem Summary:
select user()returns different result after executeshow grantsshow grantscan show grants on not existed user.What is changed and how it works?
What's Changed:
auth.UserIdentitypointer on show grants.showGrantsto avoid executed on not existed user.How it Works:
Because of
SHOW GRANTSchange the content inauth.Identity, when executeSHOW GRANTS, it will change the host ofUserin session variable. The result ofselect user()will changed.Related changes
Check List
Tests
Side effects
Release note
SHOW GRANTScan show grants for not existed user.