Details
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Task
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Resolution: Unresolved
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Major - P3
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Query Execution
Description
Currently the SBE hash join operator always uses the 'outer' side as the 'build' side. For the $group/$lookup project, the right(inner) side of $lookup will always be the build side. Since $lookup performs a left-outer join, we will have to flip the join sides. We must make HashJoin support right outer joins.