谢谢回复，等1.11.0出来我再试试。
在 2020-06-03 18:00:06，"godfrey he" <godfre...@gmail.com> 写道：
> hi 元灵，
> 这个是个已知bug: https://issues.apache.org/jira/browse/FLINK-17753，目前正在fix。
>
>Bests,
>Godfrey
>
>元灵 <liuyudat...@126.com> 于2020年6月3日周三 下午5:39写道：
>
>> 大家好，请教个问题：
>> 我在pyflink中使用SQL DDL创建kafka源，如下：
>> kafka_source_ddl = """
>> CREATE TABLE kafka_source_tb (
>> name VARCHAR,
>> number INT,
>> msgtime TIMESTAMP,
>> WATERMARK FOR msgtime AS msgtime
>> ) WITH (
>> 'connector.type' = 'kafka',
>> 'connector.version' = 'universal',
>> 'connector.topic' = 'mytopic',
>> 'connector.properties.zookeeper.connect' = 'localhost:2181',
>> 'connector.properties.bootstrap.servers' = 'localhost:9092',
>> 'format.type' = 'json',
>> 'format.derive-schema' = 'true'
>> )
>> """
>> st_env.sql_update(kafka_source_ddl)
>>
>>
>> 在使用窗口时报错，代码如下：
>> st_env.from_path("kafka_source_tb") \
>>
>> .window(Slide.over("10.secends").every("1.secends").on("msgtime").alias("msgtime"))
>> \
>> .group_by("msgtime") \
>> .select("msgtime.start as b, msgtime.end as c, msgtime.rowtime
>> as d") \
>>
>>
>> 报错如下
>> : org.apache.flink.table.api.ValidationException: A group window expects a
>> time attribute for grouping in a stream environment.
>> at
>> org.apache.flink.table.operations.utils.factories.AggregateOperationFactory.validateStreamTimeAttribute(AggregateOperationFactory.java:293)
>> at
>> org.apache.flink.table.operations.utils.factories.AggregateOperationFactory.validateTimeAttributeType(AggregateOperationFactory.java:278)
>> at
>> org.apache.flink.table.operations.utils.factories.AggregateOperationFactory.getValidatedTimeAttribute(AggregateOperationFactory.java:271)
>> at
>> org.apache.flink.table.operations.utils.factories.AggregateOperationFactory.createResolvedWindow(AggregateOperationFactory.java:233)
>> at
>> org.apache.flink.table.operations.utils.OperationTreeBuilder.windowAggregate(OperationTreeBuilder.java:243)
>> at
>> org.apache.flink.table.api.internal.TableImpl$WindowGroupedTableImpl.select(TableImpl.java:762)
>> at
>> org.apache.flink.table.api.internal.TableImpl$WindowGroupedTableImpl.select(TableImpl.java:747)
>>
>>
>> 我看到有人说直接使用api的rowtime函数好像有bug，就选了用DDL的，这个error是否相关？或者是我哪里写错了？
>>
>>
>> 请大家帮忙看一下
>> 谢谢！
>>
>>
