[
https://issues.apache.org/jira/browse/IOTDB-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17080427#comment-17080427
]
WangChao commented on IOTDB-557:
--------------------------------
"By using generalized "and" and "or", we can replace such a filter tree with
just one filter node", how to express it ? I do not understand why it work.
> Use generalized "and" and "or"
> ------------------------------
>
> Key: IOTDB-557
> URL: https://issues.apache.org/jira/browse/IOTDB-557
> Project: Apache IoTDB
> Issue Type: Improvement
> Components: Planner/SQLOptimizer
> Reporter: Tian Jiang
> Priority: Minor
> Labels: expression, query
>
> We only use binary "and" and "or" in expression construction, as a result, a
> filter like "root.group1.*.s1 > 1" (* ranges from d1 to d100) will result in
> a filter tree of over 100 nodes, which could be a great waste when there are
> even more series.
> By using generalized "and" and "or", we can replace such a filter tree with
> just one filter node, which I think could relieve the Java GC a lot.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
