impl build_nulls_with_buffer. #580

Job	Run time
Check cargo fmt	38s
build with wasm-pack	2m 38s
Check License Header	2m 10s
cargo check	7m 39s
cargo test (macos)	10m 1s
cargo test (macos-aarch64)	7m 12s
Verify MSRV (Min Supported Rust Version)	9m 1s
Verify Vendored Code	51s
cargo test (win64)	26m 39s
cargo test hash collisions (amd64)	17m 27s
check Cargo.toml formatting	2m 56s
check configs.md and ***_functions.md is up-to-date	3m 10s
cargo doc	2m 57s
clippy	2m 23s
cargo test (amd64)	11m 7s
cargo test datafusion-cli (amd64)	4m 19s
cargo test doc (amd64)	16m 37s
cargo examples (amd64)	13m 57s
Run sqllogictest with Postgres runner	4m 2s
cargo test pyarrow (amd64)	2m 57s
verify benchmark results (amd64)	13m 19s
	2h 42m 0s

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