Push down some expressions to Dict layout reader's cached values #3766

Job	Run time
Rust publish dry-run	28s
Python (wheel build)	5m 19s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=27681060745/runner=arm64-medium/imag...	2m 2s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=27681060745/runner=amd64-medium/image...	1m 22s
Compat check / compat-test	5m 38s
	14m 49s

Provide feedback