s1ck opened a new pull request #24107: [SPARK-27174][SQL] Add support for 
casting integer types to binary
URL: https://github.com/apache/spark/pull/24107
 
 
   Co-authored-by: Philip Stutz <[email protected]>
   
   ## What changes were proposed in this pull request?
   
   This PR adds support for casting
   
   * `ByteType`
   * `ShortType`
   * `IntegerType`
   * `LongType`
   
   to `BinaryType`.
   
   ## How was this patch tested?
   
   We added unit tests for casting instances of the above types. For 
validation, we used Javas `DataOutputStream` to compare the resulting byte 
array with the result of `Cast`.
   
   We state that the contribution is our original work and that we license the 
work to the project under the project’s open source license.
   
   @cloud-fan we'd appreciate a review if you find the time, thx

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