[python] Push limit down to the reader layer for PK merge-on-read#7808

JingsongLi merged 2 commits into

apache:masterapache/paimon:masterfrom

TheR1sing3un:py-limit-pushdown-merge-on-readTheR1sing3un/incubator-paimon:py-limit-pushdown-merge-on-readCopy head branch name to clipboard