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https://issues.apache.org/jira/browse/CALCITE-4424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17244724#comment-17244724
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Jiatao Tao commented on CALCITE-4424:
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In -CALCITE-1552- , we add annotation (Deterministic/NonDeterministic), it
seems mainly for execution, what I proposing here is in RexNode level, mainly
for optimizing level.
In CALCITE-4413 , we can see a double rand() after optimization, it not with
expectations.
We've had a utility method named RexUtil.isDeterministic(RexNode) and I want to
use this to judge whether a rexnode is deterministic or not, but I think it's
not imperfect now, like rand(), it returns true.
> Complete non-deterministic function in SqlFunction
> --------------------------------------------------
>
> Key: CALCITE-4424
> URL: https://issues.apache.org/jira/browse/CALCITE-4424
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jiatao Tao
> Assignee: Jiatao Tao
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Current only SqlSequenceValueOperator override isDeterministic, func like
> RAND doesn't override isDeterministic, these func seems are not
> deterministic(the list comes from "isDynamicFunction"):
> 1. SqlAbstractTimeFunction
> 2. SqlBaseContextVariable
> 3. SqlCurrentDateFunction
> 4. SqlRandFunction
> 5. SqlRandIntegerFunction
>
>
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