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  1. Sub-task SPARK-12024
    Improved multi-column counting
  2. Sub-task SPARK-11850
    Spark StdDev/Variance defaults are incompatible with Hive
  3. Sub-task SPARK-11840
    Restore the 1.5's behavior of planning a single distinct aggregation.
  4. Sub-task SPARK-11490
    variance should alias var_samp instead of var_pop
  5. Sub-task SPARK-11451
    Support single distinct count on multiple columns
  6. Sub-task SPARK-11053
    Remove use of KVIterator in SortBasedAggregationIterator
  7. Sub-task SPARK-11028
    When planning queries without partial aggregation support, we should try to use TungstenAggregate.
  8. Sub-task SPARK-11027
    Better group distinct columns in query compilation
  9. Sub-task SPARK-11017
    Support ImperativeAggregates in TungstenAggregate
  10. Sub-task SPARK-10992
    Partial Aggregation Support for Hive UDAF
  11. Sub-task SPARK-10988
    Reduce duplication in Aggregate2's expression rewriting logic
  12. Sub-task SPARK-10941
    .Refactor AggregateFunction2 and AlgebraicAggregate interfaces to improve code clarity
  13. Sub-task SPARK-10765
    use new aggregate interface for hive UDAF
  14. Sub-task SPARK-10429
    MutableProjection should evaluate all expressions first and then update the mutable row
  15. Sub-task SPARK-10167
    We need to explicitly use transformDown when rewrite aggregation results
  16. Sub-task SPARK-10100
    Eliminate hash table lookup if there is no grouping key in aggregation.
  17. Sub-task SPARK-9920
    The simpleString of TungstenAggregate does not show its output
  18. Sub-task SPARK-9830
    Remove AggregateExpression1 and Aggregate Operator used to evaluate AggregateExpression1s
  19. Sub-task SPARK-9753
    TungstenAggregate should also accept InternalRow instead of just UnsafeRow
  20. Sub-task SPARK-9741
    approx count distinct function
  21. Sub-task SPARK-9740
    first/last aggregate NULL behavior
  22. Sub-task SPARK-9664
    Use sqlContext.udf to register UDAFs.
  23. Sub-task SPARK-9630
    Cleanup Hybrid Aggregate Operator.
  24. Sub-task SPARK-9422
    Remove the placeholder attributes used in the aggregation buffers
  25. Sub-task SPARK-9361
    Refactor new aggregation code to reduce the times of checking compatibility
  26. Sub-task SPARK-9349
    UDAF cleanup for 1.5
  27. Sub-task SPARK-9301
    collect_set and collect_list aggregate functions
  28. Sub-task SPARK-9300
    histogram_numeric aggregate function
  29. Sub-task SPARK-9299
    percentile and percentile_approx aggregate functions
  30. Sub-task SPARK-9298
    corr aggregate functions
  31. Sub-task SPARK-9297
    covar_pop and covar_samp aggregate functions
  32. Sub-task SPARK-9296
    variance, var_pop, and var_samp aggregate functions
  33. Sub-task SPARK-9294
    cleanup comments, code style, naming typo for the new aggregation
  34. Sub-task SPARK-9257
    Fix the false negative of Aggregate2Sort and FinalAndCompleteAggregate2Sort's missingInput
  35. Technical task SPARK-9242
    Audit both built-in aggregate function and UDAF interface before 1.5.0 release
  36. Sub-task SPARK-9241
    Supporting multiple DISTINCT columns
  37. Sub-task SPARK-9240
    Hybrid aggregate operator using unsafe row
  38. Sub-task SPARK-9239
    HiveUDAF support for AggregateFunction2
  39. Sub-task SPARK-6548
    stddev_pop and stddev_samp aggregate functions
  40. Sub-task SPARK-4367
    Partial aggregation support the DISTINCT aggregation
  41. Sub-task SPARK-4243
    Spark SQL SELECT COUNT DISTINCT optimization
  42. Sub-task SPARK-4233
    Simplify the Aggregation Function implementation
  43. Sub-task SPARK-3947
    Support Scala/Java UDAF
  44. Sub-task SPARK-3056
    Sort-based Aggregation
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