Chengxiang Li created FLINK-3507:
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Summary: PruneEmptyRules does not prune empty node as expected.
Key: FLINK-3507
URL: https://issues.apache.org/jira/browse/FLINK-3507
Project: Flink
Issue Type: Improvement
Reporter: Chengxiang Li
Priority: Minor
{noformat}
val t = CollectionDataSets.get3TupleDataSet(env).as('a, 'b, 'c)
.where(Literal(false))
.groupBy('b)
.select('a.sum)
{noformat}
With PruneEmptyRules instances enabled, we expect the empty Aggregate and
Project should be removed, while it's not removed after logical optimization.
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