CI build failed on main

[jonahgao]

Describe the bug

error[E0432]: unresolved import indexmap
--> datafusion/physical-expr/src/equivalence/class.rs:23:5
|
23 | use indexmap::IndexSet;
| ^^^^^^^^ use of undeclared crate or module indexmap

Details: https://github.com/apache/datafusion/actions/runs/12151105350/job/33885120868

To Reproduce

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Expected behavior

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Additional context

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