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https://issues.apache.org/jira/browse/IMPALA-14551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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woosuk.ro resolved IMPALA-14551.
--------------------------------
Resolution: Fixed
> Query hangs when selecting an expression that contains Unicode Letters
> -----------------------------------------------------------------------
>
> Key: IMPALA-14551
> URL: https://issues.apache.org/jira/browse/IMPALA-14551
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: woosuk.ro
> Assignee: woosuk.ro
> Priority: Major
> Fix For: Impala 4.4.0
>
>
> * Summary
> ** When a complex expression that contains Unicode Letters is selected
> without an alias, an error during alias mapping causes the query to hang
> before the planning phase. CANCEL QUERY is ineffective.
> * Environment
> ** Impala 4.4.0
> ** Apache Hive 3.1.3 (without HIVE-19064)
> *** *Note on HIVE-19064*
> CDP Hive (3.1.3000.x) includes
> [HIVE-19064|https://github.com/apache/hive/commit/c3007d497ca58c595da8bd78455538a1ce0e3485]
> which fixes {{allowQuotedId()}} to return a valid quotation style when
> hiveConf is null. *So,* *This issue does NOT occur with CDP Hive.*
> However, Apache Hive 3.1.3 does not include this patch.
> ** ANTLR runtime 3.3
> * Steps to Reproduce
> ** In the SELECT list, use an expression containing Unicode Letters without
> an alias.
> ** Example : `select 누적합 - lag (누적합) over (partition by day order by day)
> from base`
> * Actual Behavior
> ** During alias mapping, invoking HiveLexer triggers repeated retries
> without consuming input, and the query hangs. Threads remain RUNNABLE and
> cannot be canceled
> * Call Stack (Thread RUNNABLE state)
> {code:java}
> "Thread-3474785" Id=3484730 RUNNABLE
> ...
> at
> org.antlr.runtime.RecognitionException.<init>(RecognitionException.java:102)
> at
> org.antlr.runtime.FailedPredicateException.<init>(FailedPredicateException.java:46)
> at
> org.apache.hadoop.hive.ql.parse.HiveLexer.mIdentifier(HiveLexer.java:9623)
> at
> org.apache.hadoop.hive.ql.parse.HiveLexer.mTokens(HiveLexer.java:12524)
> at org.antlr.runtime.Lexer.nextToken(Lexer.java:89)
> at
> org.apache.impala.analysis.ToSqlUtils.hiveNeedsQuotes(ToSqlUtils.java:181)
> ...
> at
> org.apache.impala.service.JniFrontend.createExecRequest(JniFrontend.java:175)
> {code}
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