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java.lang.UnsupportedOperationException: 	at java.util.AbstractList.remove(AbstractList.java:161)	at com.zendesk.maxwell.schema.Table.removePKColumn(Table.java:299)	at com.zendesk.maxwell.schema.Table.removeColumn(Table.java:261)	at com.zendesk.maxwell.schema.ddl.ChangeColumnMod.apply(ChangeColumnMod.java:19)	at com.zendesk.maxwell.schema.ddl.TableAlter.resolve(TableAlter.java:52)	at com.zendesk.maxwell.schema.ddl.TableAlter.resolve(TableAlter.java:12)	at com.zendesk.maxwell.schema.AbstractSchemaStore.resolveSQL(AbstractSchemaStore.java:57)	at com.zendesk.maxwell.schema.MysqlSchemaStore.processSQL(MysqlSchemaStore.java:82)	at com.zendesk.maxwell.MaxwellReplicator.processQueryEvent(MaxwellReplicator.java:415)	at com.zendesk.maxwell.MaxwellReplicator.getRow(MaxwellReplicator.java:384)	at com.zendesk.maxwell.MaxwellReplicator.work(MaxwellReplicator.java:146)	at com.zendesk.maxwell.RunLoopProcess.runLoop(RunLoopProcess.java:35)	at com.zendesk.maxwell.Maxwell.start(Maxwell.java:163)	at com.zendesk.maxwell.Maxwell.main(Maxwell.java:180)