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https://issues.apache.org/jira/browse/HIVE-4642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678996#comment-13678996
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Teddy Choi commented on HIVE-4642:
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I found that most methods FilterStringColRegExpStringScalar class are same with
FilterStringColLikeStringScalar class of HIVE-4548. So I revised my spec again.
{panel}
Create AbstractFilterStringColLikeStringScalar class and move up all methods of
FilterStringColLikeStringScalar class except parseSimplePattern() method. Make
FilterStringColLikeStringScalar class and FilterStringColRegExpStringScalar
class extend AbstractFilterStringColLikeStringScalar class. Implement
constructers and parseSimplePattern() method on each class differently.
The class hierarchy will be;
{noformat}
AbstractFilterStringColLikeStringScalar
+ FilterStringColRegExpStringScalar
+ FilterStringColLikeStringScalar
{noformat}
Evaluate a REGEXP pattern ".\*abc" as a LIKE pattern "%abc" where abc contains
literal characters only. Also evaluate "abc.\*" as "abc%", ".\*abc.\*" as
"%abc%", "abc" as "abc", and others as others.
Cache a Matcher member instance on AbstractFilterStringColLikeStringScalar
class and call Matcher#reset(CharSequence).
Optimize patterns containing "_"(or ".") and literal characters only.
{panel}
> Implement vectorized RLIKE and REGEXP filter expressions
> --------------------------------------------------------
>
> Key: HIVE-4642
> URL: https://issues.apache.org/jira/browse/HIVE-4642
> Project: Hive
> Issue Type: Sub-task
> Reporter: Eric Hanson
> Assignee: Teddy Choi
>
> See title. I will add more details next week. The goal is (a) make this work
> correctly and (b) optimize it as well as possible, at least for the common
> cases.
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