only DMLMustMatchLeftMostPrefix check single index

Author: hasa1K

sqle/driver/mysql/rule/rule.go

@@ -5362,9 +5362,6 @@ func isColumnMatchedALeftMostPrefix(allCols []string, colsWithEQ, colsWithOr []s
 	multiConstraints := make([]*ast.Constraint, 0)
 	for _, constraint := range constraints {
 		if len(constraint.Keys) == 1 {
-			if checkSingleIndex(allCols, constraint) {
-				return true
-			}
 			continue
 		}
 		multiConstraints = append(multiConstraints, constraint)
@@ -5393,6 +5390,16 @@ func isColumnMatchedALeftMostPrefix(allCols []string, colsWithEQ, colsWithOr []s
 	return true
 }
 
+func checkSingleIndex(allCols []string, constraint *ast.Constraint) bool {
+	singleIndexColumn := constraint.Keys[0].Column.Name.L
+	for _, col := range allCols {
+		if col == singleIndexColumn {
+			return true
+		}
+	}
+	return false
+}
+
 func isColumnUseLeftMostPrefix(allCols []string, constraints []*ast.Constraint) bool {
 	multiConstraints := make([]*ast.Constraint, 0)
 	for _, constraint := range constraints {
@@ -5429,16 +5436,6 @@ func isColumnUseLeftMostPrefix(allCols []string, constraints []*ast.Constraint)
 	return true
 }
 
-func checkSingleIndex(allCols []string, constraint *ast.Constraint) bool {
-	singleIndexColumn := constraint.Keys[0].Column.Name.L
-	for _, col := range allCols {
-		if col == singleIndexColumn {
-			return true
-		}
-	}
-	return false
-}
-
 func checkJoinFieldUseIndex(input *RuleHandlerInput) error {
 	isUsingIndex, err := judgeJoinFieldUseIndex(input)
 	if err == nil && !isUsingIndex {