[jira] [Updated] (FLINK-21573) Support expression reuse in codegen

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-21573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-21573:
-----------------------------------
    Labels: auto-deprioritized-major stale-minor  (was: auto-deprioritized-major)

I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help the community manage its development. I see this issues has been marked as Minor but is unassigned and neither itself nor its Sub-Tasks have been updated for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is still Minor, please either assign yourself or give an update. Afterwards, please remove the label or in 7 days the issue will be deprioritized.


> Support expression reuse in codegen
> -----------------------------------
>
>                 Key: FLINK-21573
>                 URL: https://issues.apache.org/jira/browse/FLINK-21573
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Runtime
>            Reporter: Benchao Li
>            Priority: Minor
>              Labels: auto-deprioritized-major, stale-minor
>
> Currently there is no expression reuse in codegen, and this may result in more CPU overhead in some cases. E.g.
> {code:java}
> SELECT my_map['key1'] as key1, my_map['key2'] as key2, my_map['key3'] as key3
> FROM (
>   SELECT dump_json_to_map(col1) as my_map
>   FROM T
> )
> {code}
> `dump_json_to_map` will be called 3 times.



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