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https://issues.apache.org/jira/browse/CALCITE-4712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391968#comment-17391968
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Haisheng Yuan commented on CALCITE-4712:
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Yes, you are right. It is kind of randomize or round robin null values across
all the workers / computing units. We can use "randomizeNulls" instead.
> Add RelHashDistribution
> -----------------------
>
> Key: CALCITE-4712
> URL: https://issues.apache.org/jira/browse/CALCITE-4712
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Add RelHashDistribution. The hash distribution should have the following
> properties:
> {code:java}
> 1. ImmutableIntList keys; // distribution keys
> 2. ImmutableList<ImmutableBitSet> equivKeys; // equivalent keys for each
> distribution key
> 3. int bucketNum; // number of buckets or shards
> 4. boolean nullsColocated; // are NULLS colocated?
> 5. String hashFunc; // name or identity of hash function
> {code}
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