fix: Scalar checks

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.53846% with 73 lines in your changes missing coverage. Please review.

Project coverage is 79.90%. Comparing base (fe04390) to head (ead068c).
Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-plan/src/plans/aexpr/traverse.rs	80.79%	34 Missing ⚠️
crates/polars-mem-engine/src/executors/stack.rs	90.00%	4 Missing ⚠️
crates/polars-expr/src/expressions/aggregation.rs	50.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/binary.rs	40.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/column.rs	0.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/count.rs	0.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/gather.rs	0.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/rolling.rs	0.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/slice.rs	0.00%	3 Missing ⚠️
crates/polars-expr/src/expressions/sort.rs	0.00%	3 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18627      +/-   ##
==========================================
- Coverage   79.91%   79.90%   -0.01%     
==========================================
  Files        1511     1514       +3     
  Lines      203201   203315     +114     
  Branches     2891     2892       +1     
==========================================
+ Hits       162388   162460      +72     
- Misses      40263    40305      +42     
  Partials      550      550              

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