Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 1.15.0
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Component/s: None
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Labels:None
Description
In Distributed System, RelDistribution is used for Exchange or SortExchange. for some operators it may deliver RelDistribution Trait, but some operator like SortedMergeJoin may deliver multiple traits.
eg:
Query:
select * from T1 join T2 on T1.c1=T2.d1;
Suppose Plan:
SortedMergeJoin
Exchange(c1)
T1(c1)
Exchange(d1)
T2(d1)
than SortedMergeJoin can deliver RelDistribution(hash[c1]) or RelDistribution(hash[d1]).
we can consider RelDistribution extend RelMultipleTrait like RelCollation.
EnumerableMergeJoin is the case for RelCollation, and RelDistribution is also fit for SortedMergeJoin in Distributed system
