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For example to take a single comprehensive Parquet data file and load it into a partitioned table, you would use an , the reduction in I/O by reading the data for each column in compressed format, which data files can be skipped (for partitioned tables), and the CPU overhead of decompressing the data for each column.data file, and decompress the contents of each column for each row group, negating the I/O optimizations of the column-oriented format.The performance benefits of this approach are amplified when you use Parquet tables in combination with partitioning.Impala can skip the data files for certain partitions entirely, based on the comparisons in the or more of data, rather than creating a large number of smaller files split among many partitions.

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As explained in How Parquet Data Files Are Organized, the physical layout of Parquet data files lets Impala read only a small fraction of the data for many queries.

The per-row filtering aspect only applies to Parquet tables.

See Runtime Filtering for Impala Queries for details.

For example, if your S3 queries primarily access Parquet files written by Map Reduce or Hive, increase As explained in Partitioning for Impala Tables, partitioning is an important performance technique for Impala generally.

This section explains some of the performance considerations for partitioned Parquet tables.

As always, run similar tests with realistic data sets of your own.

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