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add exchanges to SubqueryAlias nodes too #621

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erizocosmico
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Fixes #620

@erizocosmico erizocosmico requested a review from a team February 22, 2019 14:14
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Subqueries cannot be paralellized because they don't have partitions. We would need a way to execute a whole query partitioned for this to work. Closing for now.

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