[jira] [Created] (HIVE-26047) Vectorized LIKE UDF should use Re2J regex to address JDK-8203458

[Naresh P R (Jira)]

Naresh P R created HIVE-26047:
---------------------------------

             Summary: 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


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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