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[BEAM-4294] Join operator translator #2

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Translation of Euphoria Join suite operators (Inner, Left, Right, Full) into beam transformations. Implementation is centered around JoinTranslator which defines all the translation steps. And implementations of JoinFn which do the actual join on co-gruped elements, inspiration was drawn from org.apache.beam.sdk.extensions.joinlibrary.Join.


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@VaclavPlajt VaclavPlajt requested review from dmvk and mareksimunek May 16, 2018 08:32
…pplication of windowing in JoinTranslator fixed.
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@mareksimunek mareksimunek left a comment

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the beginning of processElement for specific Joins is the same. I could be moved to JoinFn which is their parent

c.output(Pair.of(key, outCollector.get()));
}
}
} else if (leftHasValues && !rightHasValues) {
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!rightHasValues is always true, you can delete it

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Fixed in seznam@013b078 This pull request will be closed.

joiner.apply(leftValue, null, outCollector);
c.output(Pair.of(key, outCollector.get()));
}
} else if (!leftHasValues && rightHasValues) {
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!leftHasValues is always true, you can delete it

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Fixed in seznam@013b078 This pull request will be closed.

K key = element.getKey();

Iterable<LeftT> leftSideIter = value.getAll(leftTag);
Iterable<RightT> rightSIdeIter = value.getAll(rightTag);
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variable typo. lowercase i

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Fixed in seznam@013b078 This pull request will be closed.

@VaclavPlajt
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This pull request is replaced by #seznam#1

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