[jira] [Created] (FLINK-4549) Test and document implicitly supported SQL functions

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-4549:
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             Summary: Test and document implicitly supported SQL functions
                 Key: FLINK-4549
                 URL: https://issues.apache.org/jira/browse/FLINK-4549
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Timo Walther


Calcite supports many SQL functions by translating them into {{RexNode}}s. However, SQL functions like {{NULLIF}}, {{OVERLAPS}} are neither tested nor document although supported.

These functions should be tested and added to the documentation. We could adopt parts from the Calcite documentation.



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