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  1. IMPALA
  2. IMPALA-4624

Add dictionary filtering to Parquet scanner

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      Description

      To efficiently process a highly selective scan query, just using partition pruning is too coarse grain (due to the limit on the number of partitions). For selective scan, very often, Impala can simply check the values in the Parquet dictionary page and determine that the whole row group can be thrown out.

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            • Assignee:
              joemcdonnell Joe McDonnell
              Reporter:
              alan@cloudera.com Alan Choi
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