Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4373#discussion_r129237531
--- Diff:
flink-libraries/flink-table/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java
---
@@ -1869,13 +1869,23 @@ private RexNode convertOver(Blackboard bb, SqlNode
node) {
// Walk over the tree and apply 'over' to all agg
functions. This is
// necessary because the returned expression is not
necessarily a call
// to an agg function. For example, AVG(x) becomes
SUM(x) / COUNT(x).
+
--- End diff --
I think we can remove this file for now and rely on Calcite 1.13
implementation. We don't need it anymore.
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