Preston Carman created VXQUERY-157:
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Summary: 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
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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