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https://issues.apache.org/jira/browse/CALCITE-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17892327#comment-17892327
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xiong duan commented on CALCITE-6592:
-------------------------------------
After fixing the CALCITE-6599(RelMdPredicates should pull up more predicates
from VALUES when there are several literals) this PR becomes simple. Because we
extract the {{IS NULL}} not the {{[=($0, null)]}} from the VALUES. So I change
this summary to about the UNION unit tests.
> Add test for RelMdPredicates pull up predicate from UNION when it's input
> predicates include NULL VALUE
> -------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-6592
> URL: https://issues.apache.org/jira/browse/CALCITE-6592
> Project: Calcite
> Issue Type: Bug
> Reporter: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> The RelNode:
> {code:java}
> LogicalUnion(all=[true])
> LogicalValues(tuples=[[{ NULL }]])
> LogicalValues(tuples=[[{ 131 }]]){code}
> The predicate is '$0 == 131'
> {code:java}
> LogicalUnion(all=[true])
> LogicalValues(tuples=[[{ 11 }]])
> LogicalValues(tuples=[[{ 131 }]])
> {pulled[SEARCH($0, Sarg[11, 131])]}{code}
> The Predicate is SEARCH($0, Sarg[11, 131]).
> So the first RelNode's Predicate should be NONE or SEARCH($0, Sarg[null,
> 131]) or (NULL, =($0, 5)).
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