Jesse Yates created DRILL-4615:
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Summary: Support directory names in schema
Key: DRILL-4615
URL: https://issues.apache.org/jira/browse/DRILL-4615
Project: Apache Drill
Issue Type: Improvement
Reporter: Jesse Yates
In Spark, partitioned parquet output is written with directories like:
{code}
/column1=1
/column2=hello
/data.parquet
/column2=world
/moredata.parquet
/column1=2
{code}
However, when querying these files with Drill we end up interpreting the
directories as strings when what they really are is column names + values. In
the data files we only have the remaining columns. Querying this with drill
means that you can really only have a couple of data types (far short of what
spark/parquet supports) in the column and still have correct operations.
Given the size of the data, I don't want to have to CTAS all the parquet files
(especially as they are being periodically updated).
I think this ends up being a nice addition for general file directory reads as
well since many people already encode meaning into their directory structure,
but having self describing directories is even better.
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