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Exception in thread "main" org.apache.flink.table.api.TableException: toAppendStream doesn't support consuming update changes which is produced by node GroupAggregate(groupBy=[amount, product, user], select=[amount, product, user])

解決方案:

? ? ? ? tEnv.toAppendStream(result, Row.class).print();
? ? ? ? env.execute();

改成:

? ? ? ? tEnv.toRetractStream(result, Row.class).print();
? ? ? ? env.execute();

?

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