cloud-fan commented on code in PR #42683:
URL: https://github.com/apache/spark/pull/42683#discussion_r1308084318


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala:
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@@ -53,6 +53,8 @@ import org.apache.spark.util.collection.BitSet
 private class MutableInt(var i: Int)
 
 // A tag of a `TreeNode`, which defines name and type
+// Note: In general, developers only care about its tagging capabilities,
+// so Unit should be considered first before using Boolean.

Review Comment:
   ```suggestion
   // then Unit should be considered first before using Boolean.
   ```



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