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https://issues.apache.org/jira/browse/FLINK-18862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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YUJIANBO updated FLINK-18862:
-----------------------------
Summary: sql 中agg算子的 count(1) 的结果强转成String类型再经过一次agg的操作就不能成功 (was: sql
中agg算子的 count(1) 的结果不能强转成String类型)
> sql 中agg算子的 count(1) 的结果强转成String类型再经过一次agg的操作就不能成功
> ---------------------------------------------------
>
> Key: FLINK-18862
> URL: https://issues.apache.org/jira/browse/FLINK-18862
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 1.11.1
> Reporter: YUJIANBO
> Priority: Major
> Attachments: flinksql 的count(1) 的结果值不能强转成String类型
>
>
> 1、环境：flinksql、 版本是1.11.1，perjob模式
> 2、报错： org.apache.flink.table.data.binary.BinaryRawValueData cannot be cast to
> org.apache.flink.table.data.StringData
> 3、产生的背景：
> (1)从kafka建一张表：
> {code:java}
> CREATE TABLE kafka(
> x String,
> y String
> )with(
> 'connector' = 'kafka',
> ......
> )
> {code}
> (2)建一张view表：
> {code:java}
> CREATE VIEW view1 AS
> SELECT
> x,
> y,
> cast(count(1) AS varchar) AS ct
> FROM kafka
> GROUP BY
> x, y
> {code}
> (3)然后利用这个view再做一次agg操作：
> {code:java}
> select
> x,
> LISTAGG(CONCAT_WS('=', y, ct), ',') AS lists
> FROM view1
> GROUP BY x
> {code}
> 然后就报错了：org.apache.flink.table.data.binary.BinaryRawValueData cannot be
> cast to org.apache.flink.table.data.StringData
>
> (4)但是我尝试不做agg操作，直接将count(1)的结果值转成String是可以的：
> {code:java}
> select
> x,
> CONCAT_WS('=', y, ct)
> from test
> {code}
> 4、问题：通过上面的对比说明count(1) 是能够被cast 成string的，可是再经过一次agg的操作怎么就不行了，
> 请问有什么比较好的办法解决这个问题？
> 5、稍微详细点的报错：
> {code:java}
> java.lang.ClassCastException:
> org.apache.flink.table.data.binary.BinaryRawValueData cannot be cast to
> org.apache.flink.table.data.StringData
> at
> org.apache.flink.table.data.GenericRowData.getString(GenericRowData.java:169)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.table.data.JoinedRowData.getString(JoinedRowData.java:139)
> ~[flink-table-blink_2.11-1.11.1.jar:?]
> at org.apache.flink.table.data.RowData.get(RowData.java:273)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.table.runtime.typeutils.RowDataSerializer.copyRowData(RowDataSerializer.java:156)
> ~[flink-table-blink_2.11-1.11.1.jar:1.11.1]
> at
> org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:123)
> ~[flink-table-blink_2.11-1.11.1.jar:1.11.1]
> at
> org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:50)
> ~[flink-table-blink_2.11-1.11.1.jar:1.11.1]
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:715)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:692)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:672)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:52)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:30)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:53)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.table.runtime.operators.aggregate.GroupAggFunction.processElement(GroupAggFunction.java:205)
> ~[flink-table-blink_2.11-1.11.1.jar:1.11.1]
> at
> org.apache.flink.table.runtime.operators.aggregate.GroupAggFunction.processElement(GroupAggFunction.java:43)
> ~[flink-table-blink_2.11-1.11.1.jar:1.11.1]
> at
> org.apache.flink.streaming.api.operators.KeyedProcessOperator.processElement(KeyedProcessOperator.java:85)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:161)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:178)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:153)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:67)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:345)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxStep(MailboxProcessor.java:191)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:181)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:558)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:530)
> ~[ad_features_auto-1.0-SNAPSHOT.jar:?]
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
> [ad_features_auto-1.0-SNAPSHOT.jar:?]
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
> [ad_features_auto-1.0-SNAPSHOT.jar:?]
> {code}
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