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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-5096) Local index region pruning is not working as expected.
Date Thu, 10 Jan 2019 23:11:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739851#comment-16739851
] 

Lars Hofhansl commented on PHOENIX-5096:
----------------------------------------

Note that including pk columns into the index does not add them (as [~jamestaylor] pointed
out, they are always included), but rather changes the order.

A local index key looks like this:
{{(INDEX_ID, C1, C2, ..., pk1, pk2, ...)}}

When we include the pks (say pk1 as an example) in the index the index key looks like this:
{{(INDEX_ID, pk1, C1, C2, ...,pk2, ...)}}

Then the index is no longer usable without also specifying the pk columns in the query.

Perhaps this is expected. It's just not what I had expected, and it seems more limiting than
necessary.

> Local index region pruning is not working as expected.
> ------------------------------------------------------
>
>                 Key: PHOENIX-5096
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5096
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Priority: Major
>
> The pruning of local indexes should do the following:
> * Use the local index
> * Reduce the number of regions based on filters on the table's primary key (i.e. WHERE
conditions including prefixes of the primary key)
> Instead it looks like in order for this to work the needed PK column need to be included
in the local index itself, changing the sort order of the local index.
> I'll provide some examples in the comments.
> [~giacomotaylor], [~tdsilva], [~vincentpoon], [~elserj], [~gjacoby]



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