asolimando commented on code in PR #2976:
URL: https://github.com/apache/calcite/pull/2976#discussion_r1028126808
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core/src/main/java/org/apache/calcite/rel/metadata/RelMdExpressionLineage.java:
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@@ -391,6 +392,18 @@ protected RelMdExpressionLineage() {}
return mq.getExpressionLineage(rel.getInput(), outputExpression);
}
+ /**
+ * Expression lineage from Snapshot.
+ * @param rel Relational expression which is Snapshot
+ * @param mq Metadata query
+ * @param outputExpression Expression which need be inferred
+ * @return If the lineage cannot be inferred, we return null.
+ */
Review Comment:
Thanks for adding the javadoc, in general the sentence starts with
lower-case letters, I have taken the liberty to also rephrase a couple of
sentences. No problem if you want to keep the original sentences, but please
fix the first letter casing if you do so.
```suggestion
/**
* Expression lineage from Snapshot.
* @param rel Snapshot relational expression
* @param mq metadata query
* @param outputExpression expression which needs to be inferred
* @return the inferred lineage, possibly null.
*/
```
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