Infer count() aggregation is not null #7

Job	Run time
build with wasm-pack	2m 19s
build with wasm-pack	2m 19s
cargo test (macos)	7m 42s
cargo test (macos)	7m 48s
cargo test (win64)	26m 56s
cargo test (win64)	28m 16s
cargo check	8m 3s
cargo check	8m 3s
Check cargo fmt	40s
Check cargo fmt	40s
cargo test (macos-aarch64)	7m 14s
cargo test (macos-aarch64)	7m 19s
Verify MSRV (Min Supported Rust Version)	6m 33s
Verify MSRV (Min Supported Rust Version)	6m 33s
Verify Vendored Code	54s
Verify Vendored Code	54s
cargo test datafusion-cli (amd64)	3m 50s
cargo test datafusion-cli (amd64)	3m 50s
cargo test doc (amd64)	12m 52s
cargo test doc (amd64)	12m 52s
cargo test (amd64)	9m 17s
cargo test (amd64)	9m 21s
cargo doc	3m 26s
cargo doc	3m 26s
cargo examples (amd64)	12m 48s
cargo examples (amd64)	12m 41s
Run sqllogictest with Postgres runner	3m 14s
Run sqllogictest with Postgres runner	3m 14s
verify benchmark results (amd64)	10m 37s
verify benchmark results (amd64)	10m 41s
check Cargo.toml formatting	2m 54s
check Cargo.toml formatting	2m 54s
clippy	2m 12s
clippy	2m 43s
check configs.md is up-to-date	2m 27s
check configs.md is up-to-date	2m 27s
cargo test pyarrow (amd64)	2m 47s
cargo test pyarrow (amd64)	2m 47s
cargo test hash collisions (amd64)	8m 43s
cargo test hash collisions (amd64)	9m 10s
	4h 33m 26s

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