Bruce Robbins 034913b62b [SPARK-23936][SQL] Implement map_concat ... ## What changes were proposed in this pull request? Implement map_concat high order function. This implementation does not pick a winner when the specified maps have overlapping keys. Therefore, this implementation preserves existing duplicate keys in the maps and potentially introduces new duplicates (After discussion with ueshin, we settled on option 1 from [here](https://issues.apache.org/jira/browse/SPARK-23936?focusedCommentId=16464245&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16464245)). ## How was this patch tested? New tests Manual tests Run all sbt SQL tests Run all pyspark sql tests Author: Bruce Robbins <bersprockets@gmail.com> Closes #21073 from bersprockets/SPARK-23936.		2018-07-09 21:21:38 +09:00
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src	[SPARK-23936][SQL] Implement map_concat	2018-07-09 21:21:38 +09:00
pom.xml	[SPARK-19550][BUILD][FOLLOW-UP] Remove MaxPermSize for sql module	2018-01-15 07:49:34 -06:00