englefly commented on code in PR #11067:
URL: https://github.com/apache/doris/pull/11067#discussion_r926816905
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Alias.java:
##########
@@ -116,14 +115,13 @@ public String toString() {
return child().toString() + " AS `" + name + "`#" + exprId;
}
- public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
- return visitor.visitAlias(this, context);
- }
-
@Override
public Expression withChildren(List<Expression> children) {
Preconditions.checkArgument(children.size() == 1);
return new Alias(exprId, children.get(0), name);
}
+ public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
Review Comment:
why just move this function's position?
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/types/DataType.java:
##########
@@ -72,4 +74,19 @@ public static DataType convertFromCatalogDataType(Type
catalogType) {
public abstract Type toCatalogDataType();
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+ return true;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash();
Review Comment:
it is better to return 0 directly. Objects.hash() will return 0.
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Alias.java:
##########
@@ -98,12 +98,11 @@ public boolean equals(Object o) {
if (o == null || getClass() != o.getClass()) {
return false;
}
- if (!super.equals(o)) {
- return false;
- }
- Alias alias = (Alias) o;
- return exprId.equals(alias.exprId) && name.equals(alias.name)
- && qualifier.equals(alias.qualifier) &&
children.equals(alias.children);
+ Alias that = (Alias) o;
+ return exprId.equals(that.exprId)
Review Comment:
how about remove "exprId.equals(that.exprId)" ?
do you have an example to illustrate its necessity?
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/types/VarcharType.java:
##########
@@ -38,4 +40,18 @@ public static VarcharType createVarcharType(int len) {
public Type toCatalogDataType() {
return ScalarType.createVarcharType(len);
}
+
+ @Override
+ public boolean equals(Object o) {
+ if (!super.equals(o)) {
+ return false;
+ }
+ VarcharType that = (VarcharType) o;
Review Comment:
this may throw java.lang.ClassCastException. It is better to compare their
class before convert.
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/ComparisonPredicate.java:
##########
@@ -77,7 +77,7 @@ public boolean equals(Object o) {
return false;
}
ComparisonPredicate other = (ComparisonPredicate) o;
- return (type == other.getType()) && Objects.equals(left(),
other.left())
+ return Objects.equals(left(), other.left())
Review Comment:
Could you explain why we do not compare type?
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