Jark Wu commented on FLINK-16781:

I don't against with this feature. But maybe [~ykt836] has some concerns.
I think the problem is how to expose the cache configuration in 

> add built-in cache mechanism for LookupableTableSource in lookup join
> ---------------------------------------------------------------------
>                 Key: FLINK-16781
>                 URL: https://issues.apache.org/jira/browse/FLINK-16781
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / API
>            Reporter: Bowen Li
>            Priority: Major
> Currently there's no built-in cache mechanism for LookupableTableSource. 
> Developers have one of the following options:
> 1) build their own cache
> 2) use external cache services, like redis, memcached, etc, which Flink 
> unfortunately doesn't have an out-of-box lookup function either
> 3) give up caching and bear with poor lookup performance
> Flink should provide a generic caching layer for all the 
> LookupableTableSource to take advantage of.
> cc [~ykt836] [~jark] [~lzljs3620320]

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