fix: build the IN list static filter only from literal-only items

[ranflarion]

Which issue does this PR close?

• Closes Wrong results from IN when a list item is a CASE that reads a column #26082.

Rationale for this change

n IN (2, 100, 101, CASE WHEN d > 5 THEN 1 ELSE d END * 5) returns wrong results on every row (repro in #26082). try_evaluate_constant_list decides that a list is constant by evaluating it on an empty batch, and CaseExpr returns its THEN branch as a scalar for a zero-length WHEN mask, so the CASE item is frozen to 5 in the static filter and never evaluated per row.

What changes are included in this PR?

try_evaluate_constant_list returns None unless every leaf of every list item is a Literal, so any other list takes the per-batch evaluation InListExpr already uses for items that return arrays. Lists of literals, casts of literals and other expressions over literals still build the static filter from their empty-batch evaluation, as before.

Checking leaves rather than collect_columns keeps the rule independent of which leaf types read the input (Column, LambdaVariable, or a leaf defined outside DataFusion). The cost is that an item with a non-literal leaf that is nonetheless constant, such as a stable function the optimizer did not fold, is now evaluated per batch instead of once.

What is the testing strategy for this PR?

A new section in in_list.slt runs the repro as a projection and as a filter, and test_in_list_case_item_reading_a_column builds the same expression through in_list(). Both fail on main and pass with this change. The other in_list unit tests, the physical-expr lib tests, the full sqllogictest suite and the filter_pushdown integration tests pass unchanged.

Are there any user-facing changes?

No API changes. IN lists whose items have a non-literal leaf return correct results, evaluated per batch rather than through the static filter.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 73.07692% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.77%. Comparing base (264ee3d) to head (8b38069).
⚠️ Report is 56 commits behind head on main.

Files with missing lines	Patch %	Lines
...atafusion/physical-expr/src/expressions/in_list.rs	73.07%	1 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #26083      +/-   ##
==========================================
+ Coverage   82.72%   82.77%   +0.05%     
==========================================
  Files        1147     1147              
  Lines      448013   450930    +2917     
  Branches   448013   450930    +2917     
==========================================
+ Hits       370602   373252    +2650     
- Misses      54920    54947      +27     
- Partials    22491    22731     +240     

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[jayzhan211]

Thanks @ranflarion , overall LGTM

[alamb]

FYI @geoffreyclaude

[alamb]

Thank you @ranflarion and @jayzhan211