yjshen opened a new pull request #950:
URL: https://github.com/apache/arrow-datafusion/pull/950
# Which issue does this PR close?
Closes #616 .
# Rationale for this change
Currently, we can only read files from LocalFS since we use std::fs in
ParquetExec. It would be nice to add support to read files that reside on
storage sources such as HDFS, Amazon S3, etc.
This PR substitute #811 by only adding in the ObjectStore interfaces, leave
hooking these APIs up into the rest of the system / rewrite the existing data
sources (like Parquet, etc) as separate follow-ups.
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# What changes are included in this PR?
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Introduce `ObjectStore` API as an abstraction of the underlying storage
systems, such as local filesystem, HDFS, S3, etc. And make the `ObjectStore`
implementation pluggable through the `ObjectStoreRegistery` in Datafusion's
`ExecutionContext`.
# Are there any user-facing changes?
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If there are user-facing changes then we may require documentation to be
updated before approving the PR.
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Users can provide implementations for the `ObjectStore` trait, register it
into `ExecutionContext`'s registry, and run queries against data that resides
in remote storage systems as well as local fs (the *only default
implementation* of `ObjectStore`).
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