GitHub user clockfly opened a pull request:
https://github.com/apache/spark/pull/14723
[SQL][WIP][Test] Supports object-based aggregation function which can store
arbitrary objects in aggregation buffer.
## What changes were proposed in this pull request
This PR allows user to define an AggregateFunction which can store
**arbitrary** Java objects
in aggregation buffer, and use the Java object to do aggregation. Before
this PR, user are only allowed to store a limited set of object type in
aggregation buffer. Please see example usage at
class
`org.apache.spark.sql.AggregateWithObjectAggregateBufferSuite.MaxWithObjectAggregateBuffer`
## How was this patch tested?
Unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/clockfly/spark object_aggregation_buffer_part1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14723.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 #14723
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