Rust

fix: lazily initialize BatchCoalescer in CoalescedShuffleReaderStream… #204

Job	Run time
linux build test	4m 40s
check linux workspace	3m 6s
test linux balista	6m 53s
macos test	11m 20s
test linux crates	7m 19s
Lint	37s
Clippy (amd64, stable)	4m 52s
verify benchmark results (amd64)	18m 37s
windows test	13m 26s
Check Cargo.toml formatting (amd64, stable)	1m 4s
cargo doc	4m 2s
	1h 15m 56s

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