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Trim child data in Arrow map and run-end imports #12694

Job	Run time
Rust publish dry-run	38s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=37785606286/runner=amd64-medium/image...	50s
Python (wheel build)	17m 59s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=37785606286/runner=arm64-medium/imag...	1m 4s
Compat check / compat-test	1m 8s
	21m 39s