swuferhong commented on PR #20994:
URL: https://github.com/apache/flink/pull/20994#issuecomment-1273094223

   > solution
   I think filesystem lookup table source just make sense to small files. For 
this first commit, I realized a simple `PartitionFetcher` which can only fetch 
all file partitions, but it can fetch one bulk of partitions after improving 
`PartitionFetcher` and  support partition push down. This solution can reduce 
the read data size. (BTW, I think reading partial data into cache is difficult 
for file system source, so it need to read all data into memory at once).


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