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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