expression: fold const after rewrite between (#27834) (#27841)

pingcap · Sep 6, 2021 · 53251a9 · 53251a9
1 parent daa260f
commit 53251a9
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diff --git a/planner/core/expression_rewriter.go b/planner/core/expression_rewriter.go
@@ -1615,6 +1615,8 @@ func (er *expressionRewriter) betweenToExpression(v *ast.BetweenExpr) {
 	}
 	l.SetCharsetAndCollation(dstCharset, dstCollation)
 	r.SetCharsetAndCollation(dstCharset, dstCollation)
+	l = expression.FoldConstant(l)
+	r = expression.FoldConstant(r)
 	function, err := er.newFunction(ast.LogicAnd, &v.Type, l, r)
 	if err != nil {
 		er.err = err

diff --git a/planner/core/expression_rewriter_test.go b/planner/core/expression_rewriter_test.go
@@ -434,6 +434,7 @@ func (s *testExpressionRewriterSuiteSerial) TestBetweenExprCollation(c *C) {
 	tk.MustExec("insert into t1 values ('a', 'B');")
 	tk.MustExec("insert into t1 values ('c', 'D');")
 	tk.MustQuery("select * from t1 where a between 'B' and c;").Check(testkit.Rows("c D"))
+	tk.MustQuery("explain select * from t1 where 'a' between 'g' and 'f';").Check(testkit.Rows("TableDual_6 0.00 root  rows:0"))
 
 	tk.MustGetErrMsg("select * from t1 where a between 'B' collate utf8mb4_general_ci and c collate utf8mb4_unicode_ci;", "[expression:1270]Illegal mix of collations (latin1_bin,IMPLICIT), (utf8mb4_general_ci,EXPLICIT), (utf8mb4_unicode_ci,EXPLICIT) for operation 'between'")
 }