snuyanzin opened a new pull request #6614: [FLINK-9432] Support extract 
timeunit: DECADE, EPOCH, ISODOW, ISOYEAR…
URL: https://github.com/apache/flink/pull/6614
 
 
   ## What is the purpose of the change
   The PR provides implementation of `extract` function for timeunits: 
`decade`, `epoch`, `isodow`, `isoyear`, 'millisecond`,`microsecond`
   
   ## Brief change log
   
   - support timeunits `extract`
   - documentation updates (mention all possible timeunits for `extract`)
   - tests
   
   ## Verifying this change
     - *Added tests validates the result of `extract` call*
     - *Added tests validates that `extract` of `isodow`, `isodoy`, `epoch`, 
`decade` for time is incorrect*
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes)
     - If yes, how is the feature documented? (docs)
       functions.md updated
   

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