[FLINK-39197][jdbc&mysql] Fix NPE when finding chunk end #2129

Job	Run time
License Check	6m 43s
Source E2E Tests / test (11, 1.19.3, source_e2e)	23m 50s
Source E2E Tests / test (11, 1.20.3, source_e2e)	24m 44s
Common Unit Tests / test (11, generic, core)	14m 20s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 18m 35s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 21m 10s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	37m 3s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	1h 1m 30s
Source Unit Tests / test (11, generic, mysql-source)	46m 56s
Source Unit Tests / test (11, generic, db2, mongodb)	44m 22s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 20m 19s
Source Unit Tests / test (11, generic, oracle, sqlserver)	49m 17s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 23m 28s
	10h 32m 17s

Provide feedback