[jira] [Created] (PARQUET-548) Add Java metadata for PageEncodingStats

["Ryan Blue (JIRA)" <ji...@apache.org>]

Ryan Blue created PARQUET-548:
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             Summary: Add Java metadata for PageEncodingStats
                 Key: PARQUET-548
                 URL: https://issues.apache.org/jira/browse/PARQUET-548
             Project: Parquet
          Issue Type: New Feature
          Components: parquet-mr
            Reporter: Ryan Blue
            Assignee: Ryan Blue


PARQUET-384 needs to determine whether an entire column chunk is dictionary-encoded, but it is difficult to detect that case based on the set of encodings for a column. For 1.0, this can be done by checking for a PLAIN page because both dictionary pages and dictionary-encoded pages use PLAIN_DICTIONARY and RLE/BIT_PACKING is only used for repetition and definition levels. But for 2.0, dictionary pages might be using PLAIN and there is no way to tell if a column has fallen back.

[PageEncodingStats|https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L449] were added to the format to solve this problem, so we just need to implement them.



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