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https://issues.apache.org/jira/browse/FLINK-7403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek updated FLINK-7403:
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Component/s: (was: Table SQL / API)
Table SQL / Legacy Planner
> Remove expandLocalRef() before code generation
> ----------------------------------------------
>
> Key: FLINK-7403
> URL: https://issues.apache.org/jira/browse/FLINK-7403
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Legacy Planner
> Reporter: Timo Walther
> Assignee: Hequn Cheng
> Priority: Major
>
> Currently, we expand local references before code generation. This means that
> expressions that actually only need to be evaluated once, might be evaluated
> multiple times. We should remove the expand step where possible.
> Take the following query as an example:
> {code:java}
> t.select(func0('c), func0('c), func0('c))
> {code}
> func0('c) is called three times for every input row even func0 is
> deterministic. It would be nice if we can reuse it.
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