Rust

Optimize `COUNT( DISTINCT ...)` for strings (up to 9x faster) #22669

Job	Run time
cargo test (macos)	16m 6s
cargo check	4m 19s
cargo test (win64)	42m 29s
Check cargo fmt	47s
Verify MSRV (Min Supported Rust Version)	7m 27s
Verify Vendored Code	1m 5s
build with wasm-pack	2m 11s
cargo test datafusion-cli (amd64)	3m 23s
cargo test doc (amd64)	10m 50s
cargo test (amd64)	9m 30s
cargo examples (amd64)	7m 43s
check Cargo.toml formatting	1m 19s
clippy	4m 50s
cargo test hash collisions (amd64)	8m 52s
cargo doc	3m 55s
check configs.md is up-to-date	2m 36s
Run sqllogictest with Postgres runner	3m 14s
cargo test pyarrow (amd64)	2m 31s
verify benchmark results (amd64)	10m 1s
	2h 23m 8s

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