fix(storage): Fix FileFeatureStorage path resolution on case-sensitive file systems #2082
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…age (microsoft#2053) - Changed FileFeatureStorage.file_name to a property that checks for existing file paths. - Preserves case sensitivity for new files and existing uppercase directories. - Maintains backward compatibility for lowercase paths. - Added verification test case.
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Summary
Fixes #2053: FileFeatureStorage incorrectly lowercases instrument directory names, causing failures on case-sensitive file systems.
What I changed
qlib/data/storage/file_storage.pyto resolve instrument directories using the correct filesystem case when available.tests/storage_tests/test_issue_2053.pyto validate behavior on case-sensitive systems.How I tested
test_issue_2053.py) that reproduces the issue by creating an uppercase instrument directory.FileFeatureStorageresolves paths correctly after the fix.Before / After
Before
FileFeatureStorage(instrument="AAPL").uri→.../aapl/close.day.bin(fails if directory isAAPL)After
FileFeatureStorage(instrument="AAPL").uri→.../AAPL/close.day.binFixes #2053