gaoxiaoqing created IMPALA-10968:
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Summary: optimize regular expression matching
Key: IMPALA-10968
URL: https://issues.apache.org/jira/browse/IMPALA-10968
Project: IMPALA
Issue Type: Improvement
Reporter: gaoxiaoqing
Assignee: gaoxiaoqing
eg:
{code:java}
select
case when p__latest_referrer rlike '.*ssid=0.*'
and city = '北京' then 1 when p__latest_referrer rlike '.*ssid=0.*'
and city = '上海' then 2 end as x
from
event_ros_p7
where
p__latest_referrer;
{code}
the above sql need match pattern '.*ssid=0.*' two times on each line，if we
store the match result on each line, it only need match one time on each line.
key: property p__latest_referrer and pattern ".*ssid"
value: true or false
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