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SPARK-12024
Improved multi-column countingSPARK-11850
Spark StdDev/Variance defaults are incompatible with HiveSPARK-11840
Restore the 1.5's behavior of planning a single distinct aggregation.SPARK-11490
variance should alias var_samp instead of var_popSPARK-11451
Support single distinct count on multiple columnsSPARK-11053
Remove use of KVIterator in SortBasedAggregationIteratorSPARK-11028
When planning queries without partial aggregation support, we should try to use TungstenAggregate.SPARK-11027
Better group distinct columns in query compilationSPARK-11017
Support ImperativeAggregates in TungstenAggregateSPARK-10992
Partial Aggregation Support for Hive UDAFSPARK-10988
Reduce duplication in Aggregate2's expression rewriting logicSPARK-10941
.Refactor AggregateFunction2 and AlgebraicAggregate interfaces to improve code claritySPARK-10765
use new aggregate interface for hive UDAFSPARK-10429
MutableProjection should evaluate all expressions first and then update the mutable rowSPARK-10167
We need to explicitly use transformDown when rewrite aggregation resultsSPARK-10100
Eliminate hash table lookup if there is no grouping key in aggregation.SPARK-9920
The simpleString of TungstenAggregate does not show its outputSPARK-9830
Remove AggregateExpression1 and Aggregate Operator used to evaluate AggregateExpression1sSPARK-9753
TungstenAggregate should also accept InternalRow instead of just UnsafeRowSPARK-9741
approx count distinct functionSPARK-9740
first/last aggregate NULL behaviorSPARK-9664
Use sqlContext.udf to register UDAFs.SPARK-9630
Cleanup Hybrid Aggregate Operator.SPARK-9422
Remove the placeholder attributes used in the aggregation buffersSPARK-9361
Refactor new aggregation code to reduce the times of checking compatibilitySPARK-9349
UDAF cleanup for 1.5SPARK-9301
collect_set and collect_list aggregate functionsSPARK-9300
histogram_numeric aggregate functionSPARK-9299
percentile and percentile_approx aggregate functionsSPARK-9298
corr aggregate functionsSPARK-9297
covar_pop and covar_samp aggregate functionsSPARK-9296
variance, var_pop, and var_samp aggregate functionsSPARK-9294
cleanup comments, code style, naming typo for the new aggregationSPARK-9257
Fix the false negative of Aggregate2Sort and FinalAndCompleteAggregate2Sort's missingInputSPARK-9242
Audit both built-in aggregate function and UDAF interface before 1.5.0 releaseSPARK-9241
Supporting multiple DISTINCT columnsSPARK-9240
Hybrid aggregate operator using unsafe rowSPARK-9239
HiveUDAF support for AggregateFunction2SPARK-6548
stddev_pop and stddev_samp aggregate functionsSPARK-4367
Partial aggregation support the DISTINCT aggregationSPARK-4243
Spark SQL SELECT COUNT DISTINCT optimizationSPARK-4233
Simplify the Aggregation Function implementationSPARK-3947
Support Scala/Java UDAFSPARK-3056
Sort-based Aggregation
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