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https://issues.apache.org/jira/browse/VXQUERY-31?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Preston Carman reassigned VXQUERY-31:
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Assignee: Preston Carman
> Complete the implementation of XQuery Functions and Operators
> -------------------------------------------------------------
>
> Key: VXQUERY-31
> URL: https://issues.apache.org/jira/browse/VXQUERY-31
> Project: VXQuery
> Issue Type: Improvement
> Reporter: Vinayak Borkar
> Assignee: Preston Carman
> Labels: gsoc, gsoc2012, mentor
>
> VXQuery is an XQuery compiler and runtime being built to comply with version
> 1.0 of the XQuery spec at http://www.w3.org/TR/XQuery. The distinguishing
> characteristic of this runtime is that it is designed to evaluate queries on
> large amounts of XML data. VXQuery uses the Hyracks platform
> (http://code.google.com/p/hyracks), a parallel dataflow engine, to
> parallelize queries so they can run on a cluster of shared-nothing computers.
> We plan to exploit three kinds of parallelism within the XQuery engine while
> evaluating a single query.
> 1. Independent parallelism: Parts of a query that are unrelated to each other
> can be evaluated in parallel.
> 2. Partitioned parallelism: The engine partitions data (both input data as
> well as intermediate data) and processes the partitions in parallel.
> 3. Pipelined parallelism: The runtime organizes the work done to evaluate a
> query as a sequence of workers. As and when work is completed on a piece of
> data, the results of that piece are handed to the next worker, while the
> first can process the next piece of data. This is similar to an assembly line
> used in manufacturing plants.
> Hyracks provides a set of operators to be able to evaluate queries in
> parallel. However, it does not know anything about VXQuery or the XQuery
> language and datamodel.
> Currently we have a parser and translator that converts XQuery into a logical
> form ready for evaluation.
> The task that needs to be done as part of this project is to implement
> functions that will plug into Hyracks operators so we can evaluate XQuery
> queries.
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