morrySnow commented on code in PR #11513:
URL: https://github.com/apache/doris/pull/11513#discussion_r937642430
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/util/SlotExtractor.java:
##########
@@ -49,24 +47,24 @@ public static Set<Slot> extractSlot(Collection<Expression>
expressions) {
* extract slot reference.
*/
public static Set<Slot> extractSlot(Expression... expressions) {
-
- Set<Slot> slots = Sets.newLinkedHashSet();
+ Set<Slot> slots = Sets.newHashSet();
for (Expression expression : expressions) {
slots.addAll(extractSlot(expression));
}
return slots;
}
- private static List<Slot> extractSlot(Expression expression) {
- List<Slot> slots = Lists.newArrayList();
- new SlotExtractor().visit(expression, slots);
+ private static Set<Slot> extractSlot(Expression expression) {
+ Set<Slot> slots = Sets.newHashSet();
+ new SlotCollector().visit(expression, slots);
Review Comment:
maybe init a static singleton SlotCollector is better
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/util/SlotExtractor.java:
##########
@@ -49,24 +47,24 @@ public static Set<Slot> extractSlot(Collection<Expression>
expressions) {
* extract slot reference.
*/
public static Set<Slot> extractSlot(Expression... expressions) {
-
- Set<Slot> slots = Sets.newLinkedHashSet();
+ Set<Slot> slots = Sets.newHashSet();
for (Expression expression : expressions) {
slots.addAll(extractSlot(expression));
}
return slots;
}
- private static List<Slot> extractSlot(Expression expression) {
- List<Slot> slots = Lists.newArrayList();
- new SlotExtractor().visit(expression, slots);
+ private static Set<Slot> extractSlot(Expression expression) {
Review Comment:
if this function is private, i think `void extractSlot(Expression
expression, Set<Slot>)` maybe better
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