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From "Nhan Nguyen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-915) In WHERE clause, Hive failed to resolve alias for subquery with join(s)
Date Fri, 06 Nov 2009 09:41:32 GMT

    [ https://issues.apache.org/jira/browse/HIVE-915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774254#action_12774254

Nhan Nguyen commented on HIVE-915:

My example is not good enough as we can put all join clauses into sub query and create one
alias the the whole joins. This could be a workaround, however, join of multiple sub query
may have the described problem.

> In WHERE clause, Hive failed to resolve alias for subquery with join(s)
> -----------------------------------------------------------------------
>                 Key: HIVE-915
>                 URL: https://issues.apache.org/jira/browse/HIVE-915
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.4.0
>         Environment: Hadoop v0.20.1
> Latest code from Hive branch-0.4
> Linux OS (both 32bit & 64bit)
>            Reporter: Nhan Nguyen
>            Priority: Critical
> When executing the below query
> FROM (SELECT ip, country, count(1) AS total FROM eventlog WHERE prt_date=20091022 GROUP
BY ip, country) t1 JOIN bot_ip t2 ON t1.ip=t2.ip
> SELECT t1.ip, t1.country
> WHERE t1.total>0;
> I got "FAILED: Unknown exception : null" 
> WHERE clause will not know about the alias t1.
> And below is the stack trace
> 2009-11-06 11:03:12,776 ERROR ql.Driver (SessionState.java:printError(279)) - FAILED:
Unknown exception : null
> java.lang.NullPointerException
>         at org.apache.hadoop.hive.ql.parse.QBMetaData.getTableForAlias(QBMetaData.java:76)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.getTableColumnDesc(ASTPartitionPruner.java:298)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.genExprNodeDesc(ASTPartitionPruner.java:220)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.genExprNodeDesc(ASTPartitionPruner.java:234)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.genExprNodeDesc(ASTPartitionPruner.java:234)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.genExprNodeDesc(ASTPartitionPruner.java:234)
>         at org.apache.hadoop.hive.ql.parse.ASTPartitionPruner.addExpression(ASTPartitionPruner.java:397)
>         at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPartitionPruners(SemanticAnalyzer.java:624)
>         at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:4440)
>         at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:76)
>         at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:249)
>         at org.apache.hadoop.hive.ql.Driver.run(Driver.java:281)
>         at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:123)
>         at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:181)
>         at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:287)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> It runs fine when omitting WHERE clause or WHERE clause doesn't reference to any column
of t1. It also runs fine if I make no join.
> This is critical as sub-query is the current work-around for the unsupported HAVING clause.
> Hope this gets fixed soon.
> Thanks

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