[FLINK-32074][checkpoint] Merge file across checkpoints #35

Job	Run time
Pre-compile Checks / Basic QA	7m 36s
Default (Java 8) / Compile	41m 8s
Default (Java 8) / Test packaging/licensing	8m 2s
Default (Java 8) / Test (module: core)	34m 58s
Default (Java 8) / E2E (group 1)	1h 47m 6s
Default (Java 8) / Test (module: python)	29m 48s
Default (Java 8) / E2E (group 2)	1h 58m 47s
Default (Java 8) / Test (module: table)	34m 36s
Default (Java 8) / Test (module: connect)	19m 47s
Default (Java 8) / Test (module: tests)	46m 31s
Default (Java 8) / Test (module: misc)	45m 23s
	8h 13m 42s

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