yahoNanJing opened a new pull request #1223:
URL: https://github.com/apache/arrow-datafusion/pull/1223
# Which issue does this PR close?
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Closes #1060. It's a refactor version of PR #1062.
# Rationale for this change
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Currently, we can only read parquet files from local file system. It would
be nice to add support to read parquet files that reside on HDFS.
# What changes are included in this PR?
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Introduced hdfs as one of the object store. With the feature of hdfs, it
will depend on the fs-hdfs crate which provides the Rust client to hdfs. Then
we can run some sql-based unit test with data on hdfs.
# Are there any user-facing changes?
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One example for querying on the hdfs data can be seen in the method of
hdfs.run_with_register_alltypes_parquet in tests/sql.rs. Firstly create a
**HadoopFileSystem**. Then register it with **hdfs** scheme.
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