Fix Table.from_fixed reading data as schema for file-like schema_path

[Sanjays2402]

What

Table.from_fixed() reads the data file as the schema whenever schema_path is passed as a file-like object instead of a path string, so it fails (or silently mis-parses).

Root cause

In agate/table/from_fixed.py, the schema file is resolved like this:

if not hasattr(schema_path, 'read'):
    schema_f = open(schema_path, encoding=schema_encoding)
    close_schema_f = True
else:
    schema_f = path          # <-- bug: `path` is the DATA file, not the schema

When schema_path already has a read attribute (a file-like object), the else branch assigns schema_f = path — the fixed-width data stream — rather than schema_f = schema_path. The data is then handed to the schema CSV reader.

The sibling branch a few lines above resolves the data file correctly (f = path in its own else), so only the schema branch is wrong. The existing test only passes string paths, which take the open(schema_path, ...) branch, so the file-object path was never exercised.

Symptom

import io, agate
schema = "column,start,length\nname,0,10\nage,10,3\n"
data   = "Alice     030\nBob       025\n"
agate.Table.from_fixed(io.StringIO(data), io.StringIO(schema))

ValueError: Schema must contain exactly three columns: "column", "start", and "length".

(And in the rarer case where the data's first line happens to parse as a valid schema, it silently produces the wrong columns rather than erroring.)

Fix

Assign schema_f = schema_path in the else branch, mirroring how the data file's else branch assigns f = path. One line.

case	before	after
schema_path = string path	works	works (unchanged)
schema_path = file-like object	ValueError / wrong columns	works

Test

Added test_from_fixed_file_like_objects, which passes the existing examples/testfixed and examples/testfixed_schema.csv fixtures as open file objects and asserts the resulting column names, types, and rows match the string-path result.

Proof it guards the bug (stash only the source fix, keep the test):

# with fix:            2 passed
# source fix stashed:  1 failed, 1 passed
#   FAILED test_from_fixed_file_like_objects
#   ValueError: Schema must contain exactly three columns ...
# fix restored:        2 passed

The pre-existing test_from_fixed (string-path branch) passes in every state, confirming the change is surgical.

Verification

• Full suite: 396 passed (was 395; +1 new test)
• ruff check on changed files: clean
• isort --line-length 119 --check-only on changed files: clean

Also added a CHANGELOG.rst bullet under 1.14.3 - Unreleased and self-added to AUTHORS.rst.

[jpmckinney]

Thank you! Looks like a clear typo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.48%. Comparing base (b58bb9c) to head (6293052).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #813      +/-   ##
==========================================
+ Coverage   93.41%   93.48%   +0.06%     
==========================================
  Files          98       98              
  Lines        2978     2978              
==========================================
+ Hits         2782     2784       +2     
+ Misses        196      194       -2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.