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 ---- ---