planner, expression: fix simplify outer join with cast (pingcap#12701)

imtbkcat · Nov 14, 2019 · 000666a · 000666a
1 parent 2cdf1b7
commit 000666a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/expression/expression.go b/expression/expression.go
@@ -276,7 +276,7 @@ func EvaluateExprWithNull(ctx sessionctx.Context, schema *Schema, expr Expressio
 		for i, arg := range x.GetArgs() {
 			args[i] = EvaluateExprWithNull(ctx, schema, arg)
 		}
-		return NewFunctionInternal(ctx, x.FuncName.L, types.NewFieldType(mysql.TypeTiny), args...)
+		return NewFunctionInternal(ctx, x.FuncName.L, x.RetType, args...)
 	case *Column:
 		if !schema.Contains(x) {
 			return x