Github user qiuchenjian commented on the issue:
https://github.com/apache/carbondata/pull/2975
Are the decoded DimensionColumnPage are cached in DimensionRawColumnChunk,
so the function of cache is used by other code.
Such as, DimensionRawColumnChunk contains a
Map<Integer,DimensionColumnPage> cacheDimPages, when a Page is decoded, it will
cache in this map. ---
