[jira] [Commented] (VXQUERY-157) Descendant or Self with Child Path Step

["Shivani Mall (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/VXQUERY-157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682194#comment-14682194 ] 

Shivani Mall commented on VXQUERY-157:
--------------------------------------

My new patch resolves this issue. Can this be resolved?

> Descendant or Self with Child Path Step
> ---------------------------------------
>
>                 Key: VXQUERY-157
>                 URL: https://issues.apache.org/jira/browse/VXQUERY-157
>             Project: VXQuery
>          Issue Type: Improvement
>            Reporter: Preston Carman
>            Assignee: Preston Carman
>
> The system translates the slash slash into two path steps (descendant or self and child). The descendant or self expression produces many tuples that are immediately discarded by the child path expression.
> An optimization would be to provide both path steps in a single expression. The single expression would minimize materialization and filter the results.
> Suggestion: create a expression that executes both descendant and self and child in a single runtime expression.
>  - Needs runtime and rewrite rule to implement. 



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