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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9907) add CRC32 checksum in table Api and sql
Date Sun, 22 Jul 2018 15:36:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552053#comment-16552053
] 

ASF GitHub Bot commented on FLINK-9907:
---------------------------------------

GitHub user xueyumusic opened a pull request:

    https://github.com/apache/flink/pull/6382

    [FLINK-9907][Table API & SQL] add CRC32 support

    ## What is the purpose of the change
    This PR adds CRC32 checksum compute in table api and sql.It returns the cyclic redundancy
check value of a given string as a 32-bit unsigned value, null if string is null
    The syntax is like `CRC32('test') = 3632233996`
    
    
    ## Brief change log
    *expressionDsl and hashExpression Api*
    *codegen and HashCalCallGen*
    ## Verifying this change
    This change added tests and can be verified as follows:
    
      - *Added ScalarFunctionsTest*
    
    ## 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? (not documented yet, patch doc afterward)


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/xueyumusic/flink crc32

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/6382.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #6382
    
----
commit 4dddb4ea8298b67af22d66b67c6a38cb596c9447
Author: xueyu <278006819@...>
Date:   2018-07-22T13:23:00Z

    crc32 support

----


> add CRC32 checksum in table Api and sql
> ---------------------------------------
>
>                 Key: FLINK-9907
>                 URL: https://issues.apache.org/jira/browse/FLINK-9907
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API &amp; SQL
>            Reporter: xueyu
>            Priority: Major
>              Labels: pull-request-available
>
> CRC32 returns the cyclic redundancy check value of a given string as a 32-bit unsigned
value, null if string is null. In mysql and hive the syntax like
> select CRC32('test') = 3632233996
> Though it is not a hash function, however the pattern and behavior looks similar with
hash functions (md5, sha1, sha2 etc..), so I put codegen in HashCalcCallGen



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