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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