fix flag issue

pingcap · Jan 13, 2021 · 70e7d28 · 70e7d28
1 parent 2921034
commit 70e7d28
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/expression/builtin_arithmetic.go b/expression/builtin_arithmetic.go
@@ -345,8 +345,8 @@ func (c *arithmeticMinusFunctionClass) getFunction(ctx sessionctx.Context, args
 		}
 
 		forceToSigned := ctx.GetSessionVars().SQLMode.HasNoUnsignedSubtractionMode()
-		isLHSUnsigned := mysql.HasUnsignedFlag(args[0].GetType().Flag)
-		isRHSUnsigned := mysql.HasUnsignedFlag(args[1].GetType().Flag)
+		isLHSUnsigned := !forceToSigned && mysql.HasUnsignedFlag(args[0].GetType().Flag)
+		isRHSUnsigned := !forceToSigned && mysql.HasUnsignedFlag(args[1].GetType().Flag)
 
 		switch {
 		case forceToSigned && isLHSUnsigned && isRHSUnsigned: