xccui commented on issue #6888: [FLINK-10463][table] Null literal cannot be properly parsed in Java Table API function call URL: https://github.com/apache/flink/pull/6888#issuecomment-435572138 Sorry for the late response @hequn8128. As illustrated in [this stackoverflow question](https://stackoverflow.com/questions/26453870/scala-packratparsers-does-not-backtrack-as-it-should), patterns reordering could be the proper way to deal with this problem. +1 to your solution. BTW, @twalthr, it seems that the doc for expression syntax in `TableAPI.md` has not been maintained for a long time. As the syntax being more and more complicated, do you think we should still keep them “strongly consistent” with the codes?
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