Rust

Infer count() aggregation is not null #19

Job	Run time
Check cargo fmt	39s
cargo check	3m 44s
build with wasm-pack	2m 21s
cargo test (macos)	10m 38s
cargo test (macos-aarch64)	9m 34s
Verify MSRV (Min Supported Rust Version)	6m 26s
Verify Vendored Code	50s
cargo test (win64)	34m 25s
cargo examples (amd64)	13m 10s
cargo test datafusion-cli (amd64)	3m 51s
clippy	5m 23s
cargo test hash collisions (amd64)	8m 52s
cargo test (amd64)	9m 25s
cargo doc	3m 42s
cargo test doc (amd64)	13m 22s
Run sqllogictest with Postgres runner	3m 9s
cargo test pyarrow (amd64)	2m 34s
verify benchmark results (amd64)	10m 14s
check configs.md is up-to-date	2m 30s
check Cargo.toml formatting	2m 43s
	2h 27m 32s

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