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Posted to dev@drill.apache.org by "Hari Sekhon (JIRA)" <ji...@apache.org> on 2015/07/21 13:42:05 UTC

[jira] [Created] (DRILL-3525) Drill proper DESCRIBE support for Parquet

Hari Sekhon created DRILL-3525:
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             Summary: Drill proper DESCRIBE support for Parquet
                 Key: DRILL-3525
                 URL: https://issues.apache.org/jira/browse/DRILL-3525
             Project: Apache Drill
          Issue Type: Bug
          Components: Metadata, Storage - Parquet
    Affects Versions: 1.1.0
            Reporter: Hari Sekhon
            Assignee: Steven Phillips


Request to add full DESCRIBE support for Parquet.

Currently the describe command results in a blank table being printed instead of the schema, which is unhelpful, so I do a select * limit 1 instead.

While trying to describe lots of Parquet data could be inefficient, I propose the following solution:

Read the first parquet file and assume that is the schema. Extend the DESCRIBE command to have a user-configurable number of parquet files to read to present a merged schema for the data source, as well as an ALL keywords to scan all parquet files to create true global schema.



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