[jira] [Created] (VXQUERY-93) New Rewrite Rule for Set of Collections

["Preston Carman (JIRA)" <ji...@apache.org>]

Preston Carman created VXQUERY-93:
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             Summary: New Rewrite Rule for Set of Collections
                 Key: VXQUERY-93
                 URL: https://issues.apache.org/jira/browse/VXQUERY-93
             Project: VXQuery
          Issue Type: Improvement
            Reporter: Preston Carman
            Assignee: Preston Carman


Found that a new query that collection rule will need to support. Collections in this form are not being found by the rewrite rules to alter the query for parallel processing. The rewriter needs to find all collections and union the result from the new data source scan operators.

Example Query:
for $x in (collection("folder1"), collection("folder2"))
return $x

Search Operators (example section):
                  unnest $$6 <- function-call: vxquery:{urn}iterate, Args:[%0->$$5] -- |UNPARTITIONED|
                    assign [$$5] <- [function-call: vxquery:{urn}concatenate, Args:[%0->$$2, %0->$$4]] -- |UNPARTITIONED|
                      assign [$$4] <- [function-call: vxquery:{xpath-functions}collection, Args:[function-call: vxquery:{operators-ext}promote, Args:[function-call: vxquery:{xpath-functions}data, Args:[%0->$$3], {XMLSchema}int QUANT_ONE(bytes[5] = [1d00000007])]]] -- |UNPARTITIONED|
                        assign [$$3] <- [{XMLSchema}string QUANT_ONE(bytes[68] = [...])] -- |UNPARTITIONED|
                          assign [$$2] <- [function-call: vxquery:{xpath-functions}collection, Args:[function-call: vxquery:{urn}promote, Args:[function-call: vxquery:{xpath-functions}data, Args:[%0->$$1], {XMLSchema}int QUANT_ONE(bytes[5] = [1d00000007])]]] -- |UNPARTITIONED|
                            assign [$$1] <- [{XMLSchema}string QUANT_ONE(bytes[66] = [...])] -- |UNPARTITIONED|

Suggested new Plan
  union all
    data source scan (folder1)
    data source scan (folder2)

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