woosuk.ro created IMPALA-14551:
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Summary: 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
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, Hive 3.1.3.
* 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
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