报错：
org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: No matching accumulate method found for AggregateFunction 'org.apache.flink.table.planner.functions.aggfunctions.LastValueWithRetractAggFunction.LongLastValueWithRetractAggFunction'with parameters '(java.lang.Long, java.lang.Integer)'.
排查发现代码是：
last_value(coalesce(c1),-99) as c1
需要修改成：
last_value(coalesce(c1,-99)) as c1
就是“)”位置写错了！！
Flinksql
end
