maryannxue 72561ecf4b [SPARK-22266][SQL] The same aggregate function was evaluated multiple times ... ## What changes were proposed in this pull request? To let the same aggregate function that appear multiple times in an Aggregate be evaluated only once, we need to deduplicate the aggregate expressions. The original code was trying to use a "distinct" call to get a set of aggregate expressions, but did not work, since the "distinct" did not compare semantic equality. And even if it did, further work should be done in result expression rewriting. In this PR, I changed the "set" to a map mapping the semantic identity of a aggregate expression to itself. Thus, later on, when rewriting result expressions (i.e., output expressions), the aggregate expression reference can be fixed. ## How was this patch tested? Added a new test in SQLQuerySuite Author: maryannxue <maryann.xue@gmail.com> Closes #19488 from maryannxue/spark-22266.		2017-10-18 20:59:40 +08:00
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src	[SPARK-22266][SQL] The same aggregate function was evaluated multiple times	2017-10-18 20:59:40 +08:00
pom.xml	[SPARK-14280][BUILD][WIP] Update change-version.sh and pom.xml to add Scala 2.12 profiles and enable 2.12 compilation	2017-09-01 19:21:21 +01:00