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RevolutionAnalytics / dplyr-spark

spark backend for dplyr
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semi joins not implemented in sparksql #19

Closed piccolbo closed 9 years ago

piccolbo commented 9 years ago

there seem to be a left semi join with a different syntax. We could try to map one to the other. Not clear

piccolbo commented 9 years ago

After in depth research, a left semi join is just a semi join. A right semi join is not so useful as its output can be obtained reversing the arguments in a left semi join (not so for left/right joins if order of columns matters). Implemented as part of #13. Anti semi joins not implemented yet.