Lz4Raw compression failed if input is tiny

[dantengsky]

When writing parquet file with the compression option Compression::Lz4Raw, if the input buffer is tiny, the writer fails with error

Error: General("underlying IO error: Compression failed")

e.g.

if we change the following lines

parquet2/tests/it/main.rs

Lines 75 to 78 in f8eb243

	"id" => {
	let expected = vec![4, 5, 6, 7, 2, 3, 0, 1];
	let expected = expected.into_iter().map(Some).collect::<Vec<_>>();
	Array::Int32(expected)

to

        "id" => {
            let expected = vec![4];
            let expected = expected.into_iter().map(Some).collect::<Vec<_>>();
            Array::Int32(expected)

cargo test int32_lz4 will output

---- write::int32_lz4 stdout ----
Error: General("underlying IO error: Compression failed")
.....

[dantengsky]

Sorry, PR opened in the incorrect repo :(

[jorgecarleitao]

Closed by #118