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https://issues.apache.org/jira/browse/HIVE-10455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522081#comment-14522081
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Pengcheng Xiong commented on HIVE-10455:
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As per [~jpullokkaran]'s request, [~ashutoshc], could you plz review it? Thanks.
> CBO (Calcite Return Path): Different data types at Reducer before JoinOp
> ------------------------------------------------------------------------
>
> Key: HIVE-10455
> URL: https://issues.apache.org/jira/browse/HIVE-10455
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Fix For: 1.2.0
>
> Attachments: HIVE-10455.01.patch, HIVE-10455.02.patch
>
>
> The following error occured for cbo_subq_not_in.q
> {code}
> java.lang.Exception: java.lang.RuntimeException:
> org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error: Unable
> to deserialize reduce input key from x1x128x0x0x1 with properties
> {columns=reducesinkkey0,
> serialization.lib=org.apache.hadoop.hive.serde2.binarysortable.BinarySortableSerDe,
> serialization.sort.order=+, columns.types=double}
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
> {code}
> A more easier way to reproduce is
> {code}
> set hive.cbo.enable=true;
> set hive.exec.check.crossproducts=false;
> set hive.stats.fetch.column.stats=true;
> set hive.auto.convert.join=false;
> select p_size, src.key
> from
> part join src
> on p_size=key;
> {code}
> As you can see, p_size is integer while src.key is string. Both of them
> should be cast to double when they join. When return path is off, this will
> happen before Join, at RS. However, when return path is on, this will be
> considered as an expression in Join. Thus, when reducer is collecting
> different types of keys from different join branches, it throws exception.
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