parser, ast: add `SET ROLE` support#228

Merged

tiancaiamao merged 8 commits intopingcap:masterfrom

imtbkcat:setrole

Mar 20, 2019

Commits on Mar 20, 2019

add SetRoleStmt
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add string method
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edit gomode
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fix String method
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add current_role function
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add function name
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add errcode for set role
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address comment
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