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From wuchong <...@git.apache.org>
Subject [GitHub] flink issue #2653: [FLINK-4469] [table] Add support for user defined table f...
Date Tue, 18 Oct 2016 06:36:33 GMT
Github user wuchong commented on the issue:

    https://github.com/apache/flink/pull/2653
  
    Because SQL doesn't have standard user-defined table function, we introduce MS SQL Server's
`CROSS/OUTER APPLY` to support UDTF , see https://technet.microsoft.com/en-us/library/ms175156(v=sql.105).aspx
.
    
    NOTE: In order to implement the `CROSS/OUTER APPLY`, we need to modify Calcite's SQL Parser.
So we include `Parser.jj` from Calcite source code and add some modifications (search FLINK
in this file). 
    
    See [this](https://docs.google.com/document/d/15iVc1781dxYWm3loVQlESYvMAxEzbbuVFPZWBYuY1Ek/edit#)
for more UDTF design, 


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