impl TakeNullsBuilder. #579

Job	Run time
Check License Header	2m 8s
Check cargo fmt	34s
cargo check	7m 24s
build with wasm-pack	2m 48s
cargo test (macos)	7m 40s
cargo test (macos-aarch64)	8m 48s
Verify MSRV (Min Supported Rust Version)	9m 6s
Verify Vendored Code	53s
cargo test (win64)	26m 3s
cargo test doc (amd64)	16m 44s
cargo test datafusion-cli (amd64)	4m 35s
cargo test (amd64)	10m 53s
cargo examples (amd64)	13m 51s
check configs.md and ***_functions.md is up-to-date	3m 8s
check Cargo.toml formatting	2m 58s
clippy	2m 24s
cargo test hash collisions (amd64)	17m 19s
cargo doc	2m 51s
Run sqllogictest with Postgres runner	4m 4s
cargo test pyarrow (amd64)	2m 53s
verify benchmark results (amd64)	12m 51s
	2h 39m 55s

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