Optimize DictionaryBlock#getLogicalSizeInBytes()

[yingsu00]

DictionaryBlock#getLogicalSizeInBytes() calls dictionary.getRegionSizeInBytes(position, 1); for each position. This is very slow when the dictionary is also a DictionaryBlock. Optimize this will help the OrcWriter, Unnest, and Repartitioning who uses it.

[yingsu00]

cc @prestodb/aria @biswapesh

[stale]

This issue has been automatically marked as stale because it has not had any activity in the last 2 years. If you feel that this issue is important, just comment and the stale tag will be removed; otherwise it will be closed in 7 days. This is an attempt to ensure that our open issues remain valuable and relevant so that we can keep track of what needs to be done and prioritize the right things.