Github user zhangjiajin commented on the pull request:
https://github.com/apache/spark/pull/7258#issuecomment-120564465
@feynmanliang comments: Delete makePrefixProjectedDatabases, move the
groupByKey() to the last call in this method (no need to include the two map()s
on L161 and L163 since they don't do anything)
Because the pair's key is Array(), groupByKey() don't work well, so, the
Array must be converted to seq before groupByKey, and be converted back after
groupByKey.
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