Rust

Infer count() aggregation is not null #8

Job	Run time
Check cargo fmt	43s
cargo check	7m 54s
build with wasm-pack	2m 19s
cargo test (macos)	10m 40s
cargo test (macos-aarch64)	8m 46s
Verify MSRV (Min Supported Rust Version)	6m 20s
Verify Vendored Code	51s
cargo test (win64)	33m 18s
cargo test (amd64)	9m 11s
cargo doc	3m 47s
cargo test datafusion-cli (amd64)	3m 50s
cargo examples (amd64)	13m 0s
cargo test doc (amd64)	12m 51s
verify benchmark results (amd64)	10m 19s
check Cargo.toml formatting	2m 49s
clippy	4m 57s
check configs.md is up-to-date	2m 37s
cargo test hash collisions (amd64)	9m 16s
Run sqllogictest with Postgres runner	3m 7s
cargo test pyarrow (amd64)	2m 48s
	2h 29m 23s

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