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semi joins not implemented in sparksql #19

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piccolbo opened this issue May 30, 2015 · 1 comment
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semi joins not implemented in sparksql #19

piccolbo opened this issue May 30, 2015 · 1 comment
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hiveql limitation

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

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