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  1. Parquet
  2. PARQUET-2323

Use bit vector to store Prebuffered column chunk index

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      In https://issues.apache.org/jira/browse/PARQUET-2316 we allow partial buffer in parquet File Reader by storing prebuffered column chunk index in a hash set, and make a copy of this hash set for each rowgroup reader

      In extreme conditions where numerous columns are prebuffered and multiple rowgroup readers are created for the same row group , the hash set would incur significant overhead. 

      Using bit vector would be a reasonsable mitigation, taking 4KB for 32K columns.

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              zjpzlz Jinpeng Zhou
              zjpzlz Jinpeng Zhou
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