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https://issues.apache.org/jira/browse/HIVE-26047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Naresh P R reassigned HIVE-26047:
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> Vectorized LIKE UDF should use Re2J regex to address JDK-8203458
> ----------------------------------------------------------------
>
> Key: HIVE-26047
> URL: https://issues.apache.org/jira/browse/HIVE-26047
> Project: Hive
> Issue Type: Bug
> Reporter: Naresh P R
> Assignee: Naresh P R
> Priority: Major
>
> Below pattern is taking a long time to validate regex in java8 with same
> trace as shown in java bug
> [[JDK-8203458||https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8203458]
> [https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8203458]
> []|https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8203458]
> import java.util.regex.Pattern;
> public class ABCD {
> public static void main(String args[]) {
> String pattern =
> "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b";
> Pattern CHAIN_PATTERN = Pattern.compile("(%?[^%_\\\\]+%?)+");
> CHAIN_PATTERN.matcher(pattern).matches();
> }
> }
> Same is reproducible with following SQL
> {code:java}
> create table table1(name string);
> insert into table1 (name) values
> ('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b');
> select * from table1 where name like
> "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b";{code}
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