[GitHub] XuQianJin-Stars opened a new pull request #7155: [FLINK-10009] Fix the casting problem for function TIMESTAMPADD in Table

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XuQianJin-Stars opened a new pull request #7155: [FLINK-10009] Fix the casting problem for function TIMESTAMPADD in Table
URL: https://github.com/apache/flink/pull/7155
 
 
   ## What is the purpose of the change
   
   *Fix the casting problem for function TIMESTAMPADD in Table*
   
   ## Brief change log
   
   - *In judging `ScalarOperators` `generateTemporalPlusMinus` function to add the following the `date` conversion `timestamp` of logic, are as follows:*
   
     ```scala
     case (SqlTimeTypeInfo.DATE, TimeIntervalTypeInfo.INTERVAL_MILLIS) =>
       resultType match {
         case SqlTimeTypeInfo.DATE =>
           generateOperatorIfNotNull(nullCheck, SqlTimeTypeInfo.DATE, left, right) {
             (l, r) => s"$l $op ((int) ($r / ${MILLIS_PER_DAY}L))"
           }
         case SqlTimeTypeInfo.TIMESTAMP =>
           generateOperatorIfNotNull(nullCheck, SqlTimeTypeInfo.TIMESTAMP, left, right) {
             (l, r) => s"$l * ${MILLIS_PER_DAY}L $op $r"
           }
       }
     ```
   
   ## Verifying this change
   
   *(Please pick either of the following options)*
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   *(or)*
   
   This change is already covered by existing tests, such as *(please describe tests)*.
   
   *(or)*
   
   This change added tests and can be verified as follows:
   
   *(example:)*
   
   - *TIMESTAMPADD with DATE returns a TIMESTAMP value for sub-day intervals `ScalarFunctionsTest`*
   - *Round to the last day of previous month for `ScalarFunctionsTest`*
   
   ## Does this pull request potentially affect one of the following parts:
   
   - Dependencies (does it add or upgrade a dependency): (yes / no)
   - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / no)
   - The serializers: (yes / no / don't know)
   - The runtime per-record code paths (performance sensitive): (yes / no / don't know)
   - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / no / don't know)
   - The S3 file system connector: (yes / no / don't know)
   
   ## Documentation
   
   - Does this pull request introduce a new feature? (yes / no)
   - If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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