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When performing a cross-partition update in the apply worker, it needlessly scans the old partition twice, resulting in noticeable overhead. This commit optimizes it by removing the redundant table scan. Author: Hou Zhijie Reviewed-by: Hayato Kuroda, Amit Kapila Discussion: https://postgr.es/m/OS0PR01MB571623E39984D94CBB5341D994AB2@OS0PR01MB5716.jpnprd01.prod.outlook.com