asolimando commented on code in PR #2976:
URL: https://github.com/apache/calcite/pull/2976#discussion_r1027756107
##########
core/src/main/java/org/apache/calcite/rel/metadata/RelMdExpressionLineage.java:
##########
@@ -391,6 +392,14 @@ protected RelMdExpressionLineage() {}
return mq.getExpressionLineage(rel.getInput(), outputExpression);
}
+ /**
+ * Expression lineage from Snapshot.
+ */
Review Comment:
I know that none of the other methods in the class have it, but I think it's
important to have proper javadoc for public methods of this kind, something
along this format:
```
/**
* Expression lineage from Snapshot.
* @param rel
* @param mq
* @param outputExpression
* @return
*/
```
What do you think Jiajun?
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