expression: make regex binary and rlike binary be case sen… (#11504)

Author: sre-bot

expression/builtin_like.go

@@ -95,7 +95,7 @@ func (c *regexpFunctionClass) getFunction(ctx sessionctx.Context, args []Express
 	bf := newBaseBuiltinFuncWithTp(ctx, args, types.ETInt, types.ETString, types.ETString)
 	bf.tp.Flen = 1
 	var sig builtinFunc
-	if types.IsBinaryStr(args[0].GetType()) {
+	if types.IsBinaryStr(args[0].GetType()) || types.IsBinaryStr(args[1].GetType()) {
 		sig = &builtinRegexpBinarySig{bf}
 	} else {
 		sig = &builtinRegexpSig{bf}

expression/integration_test.go

@@ -2475,18 +2475,24 @@ func (s *testIntegrationSuite) TestBuiltin(c *C) {
 	result.Check(testkit.Rows("1"))
 	result = tk.MustQuery(`select b regexp 'Xt' from t;`)
 	result.Check(testkit.Rows("1"))
+	result = tk.MustQuery(`select b regexp binary 'Xt' from t;`)
+	result.Check(testkit.Rows("0"))
 	result = tk.MustQuery(`select c regexp 'Xt' from t;`)
 	result.Check(testkit.Rows("0"))
 	result = tk.MustQuery(`select d regexp 'Xt' from t;`)
 	result.Check(testkit.Rows("0"))
 	result = tk.MustQuery(`select a rlike 'Xt' from t;`)
 	result.Check(testkit.Rows("1"))
+	result = tk.MustQuery(`select a rlike binary 'Xt' from t;`)
+	result.Check(testkit.Rows("0"))
 	result = tk.MustQuery(`select b rlike 'Xt' from t;`)
 	result.Check(testkit.Rows("1"))
 	result = tk.MustQuery(`select c rlike 'Xt' from t;`)
 	result.Check(testkit.Rows("0"))
 	result = tk.MustQuery(`select d rlike 'Xt' from t;`)
 	result.Check(testkit.Rows("0"))
+	result = tk.MustQuery(`select 'a' regexp 'A', 'a' regexp binary 'A'`)
+	result.Check(testkit.Rows("1 0"))
 
 	// testCase is for like and regexp
 	type testCase struct {