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https://issues.apache.org/jira/browse/FLINK-15595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-15595:
-----------------------------------
      Labels: auto-deprioritized-major pull-request-available  (was: 
pull-request-available stale-major)
    Priority: Minor  (was: Major)

This issue was labeled "stale-major" 7 ago and has not received any updates so 
it is being deprioritized. If this ticket is actually Major, please raise the 
priority and ask a committer to assign you the issue or revive the public 
discussion.


> Entirely implement resolution order as FLIP-68 concept
> ------------------------------------------------------
>
>                 Key: FLINK-15595
>                 URL: https://issues.apache.org/jira/browse/FLINK-15595
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / API
>            Reporter: Jingsong Lee
>            Priority: Minor
>              Labels: auto-deprioritized-major, pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> First of all, the implementation is problematic. CoreModule returns 
> BuiltinFunctionDefinition, which cannot be resolved in 
> FunctionCatalogOperatorTable, so it will fall back to FlinkSqlOperatorTable.
> Second, the function defined by CoreModule is seriously incomplete. You can 
> compare it with FunctionCatalogOperatorTable, a lot less. This leads to the 
> fact that the priority of some functions is in CoreModule, and the priority 
> of some functions is behind all modules. This is confusing, which is not what 
> we want to define in FLIP-68. 
> We should:
>  * We should resolve BuiltinFunctionDefinition correctly in 
> FunctionCatalogOperatorTable.
>  * CoreModule should contains all functions in FlinkSqlOperatorTable, a 
> simple way could provided calcite wrapper to wrap all functions.
>  * PlannerContext.getBuiltinSqlOperatorTable should not contains 
> FlinkSqlOperatorTable, we should use one 
> FunctionCatalogOperatorTable.Otherwise, there will be a lot of confusion.



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