morrySnow commented on code in PR #9807:
URL: https://github.com/apache/incubator-doris/pull/9807#discussion_r885144758
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/memo/GroupExpression.java:
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@@ -17,42 +17,47 @@
package org.apache.doris.nereids.memo;
+import org.apache.doris.nereids.operators.Operator;
import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
-import org.apache.doris.nereids.trees.plans.Plan;
import com.clearspring.analytics.util.Lists;
import java.util.BitSet;
import java.util.List;
+import java.util.Objects;
/**
* Representation for group expression in cascades optimizer.
*/
public class GroupExpression {
private Group parent;
private List<Group> children;
- private final Plan<?, ?> plan;
+ private final Operator op;
private final BitSet ruleMasks;
private boolean statDerived;
- public GroupExpression(Plan<?, ?> plan) {
- this(plan, Lists.newArrayList());
+ public GroupExpression(Operator op) {
+ this(op, Lists.newArrayList());
}
/**
* Constructor for GroupExpression.
*
- * @param plan {@link Plan} to reference
+ * @param op {@link Operator} to reference
* @param children children groups in memo
*/
- public GroupExpression(Plan<?, ?> plan, List<Group> children) {
- this.plan = plan;
- this.children = children;
+ public GroupExpression(Operator op, List<Group> children) {
+ this.op = Objects.requireNonNull(op);
+ this.children = Objects.requireNonNull(children);
this.ruleMasks = new BitSet(RuleType.SENTINEL.ordinal());
this.statDerived = false;
}
+ public int arity() {
Review Comment:
In logic, mathematics, and computer science, the arity of a function or
operation is the number of arguments or operands the function or operation
accepts.
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