expression: fix charset and collation for current_role (pingcap#16019)

sre-bot · Apr 4, 2020 · 6766b76 · 6766b76
1 parent e00c1f8
commit 6766b76
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diff --git a/expression/builtin_info.go b/expression/builtin_info.go
@@ -170,6 +170,7 @@ func (c *currentRoleFunctionClass) getFunction(ctx sessionctx.Context, args []Ex
 		return nil, err
 	}
 	bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETString)
+	bf.tp.Charset, bf.tp.Collate = ctx.GetSessionVars().GetCharsetInfo()
 	bf.tp.Flen = 64
 	sig := &builtinCurrentRoleSig{bf}
 	return sig, nil

diff --git a/expression/typeinfer_test.go b/expression/typeinfer_test.go
@@ -843,6 +843,7 @@ func (s *testInferTypeSuite) createTestCase4InfoFunc() []typeInferTestCase {
 		{"found_rows()", mysql.TypeLonglong, charset.CharsetBin, mysql.BinaryFlag | mysql.UnsignedFlag, mysql.MaxIntWidth, 0},
 		{"database()", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
 		{"current_user()", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
+		{"current_role()", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
 		{"user()", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
 		{"connection_id()", mysql.TypeLonglong, charset.CharsetBin, mysql.BinaryFlag | mysql.UnsignedFlag, mysql.MaxIntWidth, 0},
 		{"version()", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},