Rust

Infer count() aggregation is not null #25

Job	Run time
cargo check	3m 46s
cargo test (macos)	10m 10s
build with wasm-pack	2m 12s
cargo test (win64)	34m 6s
Check cargo fmt	38s
cargo test (macos-aarch64)	8m 27s
Verify MSRV (Min Supported Rust Version)	6m 11s
Verify Vendored Code	48s
cargo examples (amd64)	13m 17s
cargo test datafusion-cli (amd64)	3m 35s
cargo test (amd64)	9m 6s
cargo doc	3m 42s
cargo test doc (amd64)	13m 3s
Run sqllogictest with Postgres runner	3m 15s
cargo test pyarrow (amd64)	2m 41s
verify benchmark results (amd64)	10m 50s
check Cargo.toml formatting	2m 50s
clippy	4m 55s
check configs.md is up-to-date	2m 29s
cargo test hash collisions (amd64)	8m 53s
	2h 24m 54s

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