EmmyMiao87 commented on code in PR #9506:
URL: https://github.com/apache/incubator-doris/pull/9506#discussion_r870421188
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/ComparisonPredicate.java:
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@@ -18,42 +18,39 @@
package org.apache.doris.nereids.trees.expressions;
import org.apache.doris.nereids.exceptions.UnboundException;
-import org.apache.doris.nereids.trees.AbstractTreeNode;
import org.apache.doris.nereids.trees.NodeType;
+import org.apache.doris.nereids.types.BooleanType;
import org.apache.doris.nereids.types.DataType;
-import java.util.List;
-
/**
- * Abstract class for all Expression in Nereids.
+ * Comparison predicate expression.
+ * Such as: "=", "!=", "<", "<=", ">", ">=", "<=>"
*/
-public abstract class AbstractExpression<EXPR_TYPE extends
AbstractExpression<EXPR_TYPE>>
- extends AbstractTreeNode<EXPR_TYPE>
- implements Expression<EXPR_TYPE> {
-
- public AbstractExpression(NodeType type, Expression... children) {
- super(type, children);
- }
-
- public DataType getDataType() throws UnboundException {
- throw new UnboundException("dataType");
- }
-
- public String sql() throws UnboundException {
- throw new UnboundException("sql");
- }
-
- public boolean nullable() throws UnboundException {
- throw new UnboundException("nullable");
+public class ComparisonPredicate<
+ LEFT_CHILD_TYPE extends Expression,
+ RIGHT_CHILD_TYPE extends Expression>
+ extends Expression<ComparisonPredicate<LEFT_CHILD_TYPE, RIGHT_CHILD_TYPE>>
+ implements BinaryExpression<ComparisonPredicate<LEFT_CHILD_TYPE,
RIGHT_CHILD_TYPE>,
+ LEFT_CHILD_TYPE, RIGHT_CHILD_TYPE> {
+
+ /**
+ * Constructor of ComparisonPredicate.
+ *
+ * @param nodeType node type of expression
+ * @param left left child of comparison predicate
+ * @param right right child of comparison predicate
+ */
+ public ComparisonPredicate(NodeType nodeType, LEFT_CHILD_TYPE left,
RIGHT_CHILD_TYPE right) {
+ super(nodeType, left, right);
}
@Override
- public List<Expression> children() {
- return (List) children;
+ public DataType getDataType() throws UnboundException {
+ return BooleanType.INSTANCE;
}
@Override
- public Expression child(int index) {
- return (Expression) children.get(index);
+ public String sql() {
+ return null;
Review Comment:
It implement a general function.
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