Rust

Infer count() aggregation is not null #22

Job	Run time
cargo check	3m 31s
build with wasm-pack	2m 18s
cargo test (macos)	10m 19s
cargo test (macos-aarch64)	9m 24s
Verify Vendored Code	50s
cargo test (win64)	37m 36s
Check cargo fmt	40s
Verify MSRV (Min Supported Rust Version)	6m 35s
cargo test (amd64)	9m 8s
cargo test doc (amd64)	12m 46s
cargo test datafusion-cli (amd64)	3m 41s
cargo examples (amd64)	12m 57s
cargo doc	3m 33s
Run sqllogictest with Postgres runner	3m 7s
cargo test pyarrow (amd64)	2m 37s
verify benchmark results (amd64)	10m 24s
check Cargo.toml formatting	2m 47s
clippy	5m 21s
check configs.md is up-to-date	2m 38s
cargo test hash collisions (amd64)	8m 52s
	2h 29m 4s

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