Fix bls 3tuple

[steven-murray]

Description

Fixes a bug in selecting on UVData objects where if you used bls= with a list of 3-tuples where there is more than one polarization present, it would only select the last one.

Motivation and Context

Fixes #1505

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change (documentation changes only)
• Version change
• Build or continuous integration change

Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.

Bug fix checklist:

• My fix includes a new test that breaks as a result of the bug (if possible).
• All new and existing tests pass.
• I have updated the CHANGELOG.

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 2.

Benchmark suite	Current: dab9ed7	Previous: 72dd3bc	Ratio
tests/uvdata/test_mwa_corr_fits.py::test_read_mwa	3.9132754759465858 iter/sec (stddev: 0.035221061015886734)	7.997555508312163 iter/sec (stddev: 0.031847779135263966)	2.04
tests/uvdata/test_mwa_corr_fits.py::test_read_mwax	3.394458930320797 iter/sec (stddev: 0.10118858356508509)	7.004348042731254 iter/sec (stddev: 0.013840146951652157)	2.06

This comment was automatically generated by workflow using github-action-benchmark.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.93%. Comparing base (24120fc) to head (dab9ed7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1507   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          63       63           
  Lines       21834    21834           
=======================================
  Hits        21819    21819           
  Misses         15       15           

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[bhazelton]

@jsdillon can you check that this fixes the problem you reported in #1505 ?

[jsdillon]

@jsdillon can you check that this fixes the problem you reported in #1505 ?

Yes, I can verify that the code in #1505 produces the expected output now:

Loading 4pol using just the length-2 tuple
Found (145, 244, 'ne')
Found (145, 244, 'ne')
Found (145, 244, 'en')
Found (145, 244, 'ne')

Loading 4pol with length-3 typles using bls=
Found (145, 244, 'ne')
Found (145, 244, 'ne')
Found (145, 244, 'en')
Found (145, 244, 'ne')

Loading en and ne using bls=
Found (145, 244, 'en')
Found (145, 244, 'ne')

Loading ee and nn using bls=
Found (145, 244, 'ee')
Found (145, 244, 'nn')

Loading en and ne using polarizations=
Found (145, 244, 'en')
Found (145, 244, 'ne')