924060929 commented on code in PR #10241:
URL: https://github.com/apache/doris/pull/10241#discussion_r901277729
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Expression.java:
##########
@@ -18,18 +18,22 @@
package org.apache.doris.nereids.trees.expressions;
import org.apache.doris.nereids.exceptions.UnboundException;
-import org.apache.doris.nereids.rules.expression.rewrite.ExpressionVisitor;
import org.apache.doris.nereids.trees.AbstractTreeNode;
import org.apache.doris.nereids.trees.NodeType;
import org.apache.doris.nereids.types.DataType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
import java.util.List;
/**
* Abstract class for all Expression in Nereids.
*/
public abstract class Expression extends AbstractTreeNode<Expression> {
+ private final Logger logger = LoggerFactory.getLogger(this.getClass());
Review Comment:
static logger can not save the real child class instance for log.
e.g.
```java
logger.warn("accept() is not implemented by " + this.getClass()); // pay
attention to the 'this'
```
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