Alagappan Maruthappan created HIVE-27559:
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Summary: Query hangs while trying to determine if the LIKE clause
can be chained
Key: HIVE-27559
URL: https://issues.apache.org/jira/browse/HIVE-27559
Project: Hive
Issue Type: Bug
Reporter: Alagappan Maruthappan
Assignee: Alagappan Maruthappan
The following query
{code:java}
SELECT * FROM src WHERE key LIKE
'abc%def%ghi%jkl%mno%pqr%stu%vwxyz%abc%def%ghi%jkl%mno%pqr%stu%vwxy_z';
{code}
would hang trying to determine if the LIKE clause can be chained in
ChainedCheckerFactory. This is because the CHAIN_PATTERN is defined as
"(%?[^%_\\\\]+%?)+" which is trying to do a greedy match and ends doing a
catastrophic backtracking.
We need the full expression to match, so we can convert define this pattern
using possessive quantifier to avoid the backtracking.
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