Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2653
@fhueske I have updated this PR for the following changes.
1. Remove CROSS/OUTER APPLY support in SQL
2. Change Java Table API from `.crossApply("split(c)", "s")` to
`.corssApply("split(c) as (s)")`
3. Make `ExpressionParser` can parse a string to `LogicalNode`
I think the PR is ready to be reviewed :)
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