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warning: variant UTF8 is never constructed #13530

Description

@zhuliquan

Describe the bug

When I run cargo clippy on my Windows machine, I get the following warning:

warning: variant `UTF8` is never constructed
  --> datafusion\core\tests\parquet\mod.rs:89:5
   |
71 | enum Scenario {
   |      -------- variant in this enum
...
89 |     UTF8,
   |     ^^^^
   |
   = note: `Scenario` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
   = note: `#[warn(dead_code)]` on by default

I get the same warning when triggering the CI task cargo test (win64) as well.

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