cloud-fan opened a new pull request #24144: [SPARK-24935][SQL] fix Hive UDAF with two aggregation buffers URL: https://github.com/apache/spark/pull/24144 ## What changes were proposed in this pull request? Hive UDAF knows the aggregation mode when creating the aggregation buffer, so that it can create different buffers for different inputs: the original data or the aggregation buffer. Please see an example in the [sketches library](https://github.com/DataSketches/sketches-hive/blob/7f9e76e9e03807277146291beb2c7bec40e8672b/src/main/java/com/yahoo/sketches/hive/cpc/DataToSketchUDAF.java#L107). However, the Hive UDAF adapter in Spark always creates the buffer with partial1 mode, which can only deal with one input: the original data. This PR fixes it. ## How was this patch tested? a new test
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