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https://issues.apache.org/jira/browse/VXQUERY-157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14949131#comment-14949131
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Preston Carman commented on VXQUERY-157:
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Please post this git commit that fixed this issue and close the issue.
> 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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