aglinxinyuan opened a new issue, #8949:
URL: https://github.com/apache/texera/issues/8949
### What happened?
On Windows, a File Scan given an absolute local path with forward slashes
(`C:/Users/me/data/a.txt`) fails in the worker with:
```
Unsupported URI scheme: C for creating the ReadonlyDocument
```
**Root cause.** `FileResolver.resolve` first asks
`isFileResolved(fileName)`, which returns true for any string whose
`java.net.URI` scheme is non-empty. `new URI("C:/Users/me/data/a.txt")` parses
the drive letter `C` as the scheme. So `resolve` returns the path unchanged
instead of falling through to the local resolver, which would give
`file:///C:/Users/me/data/a.txt`. `DocumentFactory` then has no handler for
scheme `C`.
```
Before: "C:/data/a.txt" -> isFileResolved = true -> URI "C:/data/a.txt"
-> Unsupported URI scheme: C
After: "C:/data/a.txt" -> isFileResolved = false -> local resolver ->
"file:///C:/data/a.txt" -> read
```
| Operator | Where it fails |
| --- | --- |
| File Scan | worker (`FileScanSourceOpExec`) |
| File Scan From Input | worker, per tuple (`FileScanOpExec`) |
| CSV / Parallel CSV / CSVOld / JSONL / Arrow File Scan | compilation,
during schema inference |
The backslash form (`C:\data\a.txt`) is not affected: a backslash is illegal
in a URI, so it never parsed as one.
**Fix.** Treat a one-letter scheme as a Windows drive letter, not a URI
scheme, so such paths reach the local resolver. Real URIs (`file:`, `s3:`,
`vfs:`, `dataset:`, `https:` ...) stay resolved.
### How to reproduce?
On Windows, with a local stack running:
1. Add a File Scan operator whose file is an absolute local path written
with forward slashes, e.g. `C:/Users/me/data/a.txt`.
2. Run the workflow.
3. The worker fails with `Unsupported URI scheme: C for creating the
ReadonlyDocument`. A CSV File Scan with the same path reports the error at
compilation instead.
Or directly: `FileResolver.isFileResolved("C:/x/y.txt")` returns `true`, and
`FileResolver.resolve("C:/<existing file>")` returns a URI with scheme `C`
instead of a `file` URI.
### Version/Branch
1.4.0-incubating-SNAPSHOT (main), adc6a4ac4d
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