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This change adds support for skipping row groups based on Parquet row group statistics. With this change we only support reading statistics from Parquet files for numerical types (bool, integer, floating point) and for simple predicates of the forms <slot> <op> <constant> or <constant> <op> <slot>, where <op> is LT, LE, GE, GT, and EQ. Change-Id: I39b836165756fcf929c801048d91c50c8fdcdae4 Reviewed-on: http://gerrit.cloudera.org:8080/6032 Reviewed-by: Lars Volker <lv@cloudera.com> Tested-by: Impala Public Jenkins