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https://issues.apache.org/jira/browse/HIVE-13976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15335744#comment-15335744
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Kai Sasaki commented on HIVE-13976:
-----------------------------------
[~shenavandeh] Thanks for checking but I'm not sure HIVE-2 is related to this
issue.
Do you mean simply Hive version 2 instead of JIRA ticket HIVE-2?
> UNION ALL which takes actual source table in one side failed
> ------------------------------------------------------------
>
> Key: HIVE-13976
> URL: https://issues.apache.org/jira/browse/HIVE-13976
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.0
> Environment: Ubuntu 12.04, JDK 7
> Reporter: Kai Sasaki
>
> UNION ALL must take actual source table in both side or none exclusively.
> * UNION ALL with actual table in both side -> Succeed as expected
> {code}
> SELECT
> 1 AS id,
> 'Alice' AS name
> FROM
> table1
> UNION ALL
> SELECT
> 2 AS id,
> 'Bob' AS name
> FROM
> table2
> {code}
> * UNION ALL without actual table in both side -> Succeed as expected
> {code}
> SELECT
> 1 AS id,
> 'Alice' AS name
> UNION ALL
> SELECT
> 2 AS id,
> 'Bob' AS name
> {code}
> * UNION ALL with actual table on one side -> Failed
> {code}
> SELECT
> 1 AS id,
> 'Alice' AS name
> UNION ALL
> SELECT
> 2 AS id,
> 'Bob' AS name
> FROM
> some_table
> {code}
> The error message from map task of third case is this.
> {code}
> Diagnostic Messages for this Task:
> Error: java.lang.IllegalArgumentException: Can not create a Path from an
> empty string
> at org.apache.hadoop.fs.Path.checkPathArg(Path.java:127)
> at org.apache.hadoop.fs.Path.<init>(Path.java:135)
> at
> org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.getPath(HiveInputFormat.java:116)
> at org.apache.hadoop.mapred.MapTask.updateJobWithSplit(MapTask.java:458)
> {code}
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