[ShryukGrandhi]

Fixes #5677

The scalar operators on DataFrame (df + 1, 1 + df, df << 1, etc.) call straight into the instance method, so passing a null DataFrame throws a NullReferenceException from inside the library. As suggested in the triage comment, these now throw ArgumentNullException with ParamName set to df.

The bool overload mentioned in the issue no longer exists, since bool is excluded from the numeric operators, but every other operator overload had the same problem.

Changes:

• DataFrame.BinaryOperators.tt: add a null check on df to the three operator templates (scalar, reverse scalar and shift).
• DataFrame.BinaryOperators.cs: the matching change in the generated file, applied to all 112 operators. The only differences from the existing file are the added checks.
• New test TestBinaryOperatorsWithNullDataFrame covers the arithmetic, reverse and shift operators with a null DataFrame.

No public API is added or changed. Only the exception type thrown for a null argument is different.

Testing:

• Before the fix, the new test failed with NullReferenceException. After the fix, it passes.

• dotnet test test/Microsoft.Data.Analysis.Tests (net8.0, macOS arm64): 1779 passed, 6 skipped, 0 failed.

• dotnet format whitespace --verify-no-changes on the changed files: clean.

• Descriptive title

• Associated issue: NullReferenceException in DataFrame.BinaryOperators #5677

• Public API changes: N/A

• Change description

• Tests included

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[codecov]

Codecov Report

❌ Patch coverage is 12.82051% with 306 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.74%. Comparing base (cf9093a) to head (84035ed).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...crosoft.Data.Analysis/DataFrame.BinaryOperators.cs	8.92%	284 Missing and 22 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7851      +/-   ##
==========================================
- Coverage   70.81%   70.74%   -0.08%     
==========================================
  Files        1421     1421              
  Lines      280000   280351     +351     
  Branches    27620    27732     +112     
==========================================
+ Hits       198294   198342      +48     
- Misses      73548    73823     +275     
- Partials     8158     8186      +28     

Flag	Coverage Δ
Debug	70.74% <12.82%> (-0.08%)	⬇️
production	64.17% <8.92%> (-0.09%)	⬇️
test	90.77% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
....Analysis.Tests/DataFrameTests.BinaryOperations.cs	100.00% <100.00%> (ø)
...crosoft.Data.Analysis/DataFrame.BinaryOperators.cs	15.17% <8.92%> (-4.47%)	⬇️

... and 7 files with indirect coverage changes

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