cshuo opened a new pull request #9459: [FLINK-13742][table-planner-blink] Fix 
code generation when aggregation contains both distinct aggregate with and 
without filter.
URL: https://github.com/apache/flink/pull/9459
   ## What is the purpose of the change
   fix a bug of distinct aggregation code generation when there exists distinct 
aggregations on same column, and some of them have filter condition.
   ## Verifying this change
   add new IT case in 'AggregateITCase' to cover the change.
   ## 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? no

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