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[SPARK-9422] [SQL] Remove the placeholder attributes used in the aggregation buffers
https://issues.apache.org/jira/browse/SPARK-9422 Author: Yin Huai <yhuai@databricks.com> Closes #7737 from yhuai/removePlaceHolder and squashes the following commits: ec29b44 [Yin Huai] Remove placeholder attributes.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala 24 additions, 3 deletions...spark/sql/catalyst/expressions/aggregate/interfaces.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/aggregateOperators.scala 3 additions, 1 deletion...he/spark/sql/execution/aggregate/aggregateOperators.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/sortBasedIterators.scala 80 additions, 129 deletions...he/spark/sql/execution/aggregate/sortBasedIterators.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/udaf.scala 12 additions, 5 deletions...scala/org/apache/spark/sql/execution/aggregate/udaf.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/utils.scala 2 additions, 2 deletions...cala/org/apache/spark/sql/execution/aggregate/utils.scala
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