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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17958) Avoid passing unexpected cell to ScanQueryMatcher when optimize SEEK to SKIP
Date Thu, 19 Oct 2017 04:48:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210558#comment-16210558
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Lars Hofhansl commented on HBASE-17958:
---------------------------------------

bq. How about we move optimize SEEK to SKIP to storefile scanner?

Good idea. I like that.

> Avoid passing unexpected cell to ScanQueryMatcher when optimize SEEK to SKIP
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-17958
>                 URL: https://issues.apache.org/jira/browse/HBASE-17958
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: 0001-add-one-ut-testWithColumnCountGetFilter.patch, 17958-add.txt,
HBASE-17958-branch-1.patch, HBASE-17958-branch-1.patch, HBASE-17958-branch-1.patch, HBASE-17958-branch-1.patch,
HBASE-17958-v1.patch, HBASE-17958-v2.patch, HBASE-17958-v3.patch, HBASE-17958-v4.patch, HBASE-17958-v5.patch,
HBASE-17958-v6.patch, HBASE-17958-v7.patch, HBASE-17958-v7.patch
>
>
> {code}
> ScanQueryMatcher.MatchCode qcode = matcher.match(cell);
> qcode = optimize(qcode, cell);
> {code}
> The optimize method may change the MatchCode from SEEK_NEXT_COL/SEEK_NEXT_ROW to SKIP.
But it still pass the next cell to ScanQueryMatcher. It will get wrong result when use some
filter, etc. ColumnCountGetFilter. It just count the  columns's number. If pass a same column
to this filter, the count result will be wrong. So we should avoid passing cell to ScanQueryMatcher
when optimize SEEK to SKIP.



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