jorisvandenbossche commented on a change in pull request #9192:
URL: https://github.com/apache/arrow/pull/9192#discussion_r557464597
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File path: cpp/src/arrow/filesystem/hdfs.cc
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@@ -69,6 +69,14 @@ class HadoopFileSystem::Impl {
HdfsOptions options() const { return options_; }
Result<FileInfo> GetFileInfo(const std::string& path) {
+ // It has unfortunately been a frequent logic error to pass URIs down
+ // to GetFileInfo (e.g. ARROW-10264). Unlike other filesystems, HDFS
+ // silently accepts URIs but returns different results than if given the
+ // equivalent in-filesystem paths. Instead of raising cryptic errors
+ // later, notify the underlying problem immediately.
+ if (path.substr(0, 5) == "hdfs:") {
Review comment:
or "viewfs" ?
(I am not familiar with it, I only know that in the python/cython code there
are some places that checks for this as well ..)
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File path: python/pyarrow/parquet.py
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@@ -1493,15 +1493,16 @@ def __init__(self, path_or_paths, filesystem=None,
filters=None,
single_file = path_or_paths[0]
else:
if _is_path_like(path_or_paths):
- path = str(path_or_paths)
+ path_or_paths = str(path_or_paths)
if filesystem is None:
# path might be a URI describing the FileSystem as well
try:
- filesystem, path = FileSystem.from_uri(path)
+ filesystem, path_or_paths = FileSystem.from_uri(
+ path_or_paths)
Review comment:
Ah, good catch. So we were passing below still the original
`path_or_paths` URI to the dataset constructor (instead of the non-URI path
returned by from_uri), but also passing the filesystem inferred from the URI
here.
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