fix: inconsistent types in array_agg_distinct merge_batch #585

Job	Run time
Check cargo fmt	49s
cargo check	10m 25s
cargo test (mac)	19m 55s
Verify MSRV	10m 4s
Verify Vendored Code	1m 7s
cargo test (win64)	19m 45s
verify benchmark results (amd64)	48m 6s
cargo doc	7m 7s
cargo examples (amd64)	11m 44s
cargo test doc (amd64)	24m 9s
check Cargo.toml formatting	2m 32s
clippy	8m 49s
cargo test hash collisions (amd64)	20m 0s
check configs.md is up-to-date	5m 2s
cargo test (amd64)	13m 31s
cargo test datafusion-cli (amd64)	5m 20s
Run sqllogictest with Postgres runner	5m 23s
cargo test pyarrow (amd64)	3m 33s
	3h 37m 21s

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