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https://issues.apache.org/jira/browse/VXQUERY-86?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648809#comment-13648809
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Preston Carman commented on VXQUERY-86:
---------------------------------------
Added the requirement of unnest back to the rewrite rule. It looks like now the
system work for FLWOR expressions with collection as the source.
The issue remains for collection without the FLWOR expression.
> Convert Collection to DataSourceScan Operator
> ---------------------------------------------
>
> Key: VXQUERY-86
> URL: https://issues.apache.org/jira/browse/VXQUERY-86
> Project: VXQuery
> Issue Type: Sub-task
> Reporter: Preston Carman
> Assignee: Vinayak Borkar
>
> The example query has three files in the collection. It seems to be something
> related to the definition of the data source scan operator.
> Query: count(collection("path-to-folder"))
> RESULT with data source scan
> 1
> 1
> 1
> INFO: Optimized Plan:
> write [%0->$$4]
> -- SINK_WRITE |PARTITIONED|
> exchange
> -- BROADCAST_EXCHANGE |PARTITIONED|
> unnest $$4 <- function-call:
> vxquery:{urn:org.apache.vxquery.operators-ext}iterate, Args:[%0->$$3]
> -- UNNEST |PARTITIONED|
> assign [$$3] <- [function-call:
> vxquery:{http://www.w3.org/2005/xpath-functions}count, Args:[function-call:
> vxquery:{urn:org.apache.vxquery.operators-ext}treat, Args:[%0->$$2,
> {http://www.w3.org/2001/XMLSchema}int QUANT_ONE(bytes[5] = [1d000000e9])]]]
> -- ASSIGN |PARTITIONED|
> exchange
> -- ONE_TO_ONE_EXCHANGE |PARTITIONED|
> data-scan []<-[$$2] <-
> org.apache.vxquery.metadata.VXQueryCollectionDataSource@6498985e
> -- DATASOURCE_SCAN |PARTITIONED|
> exchange
> -- ONE_TO_ONE_EXCHANGE |PARTITIONED|
> empty-tuple-source
> -- EMPTY_TUPLE_SOURCE |PARTITIONED|
> RESULT with OUT data source scan
> 3
> INFO: Optimized Plan:
> write [%0->$$4]
> -- SINK_WRITE |UNPARTITIONED|
> exchange
> -- BROADCAST_EXCHANGE |PARTITIONED|
> unnest $$4 <- function-call:
> vxquery:{urn:org.apache.vxquery.operators-ext}iterate, Args:[%0->$$3]
> -- UNNEST |UNPARTITIONED|
> assign [$$3] <- [function-call:
> vxquery:{http://www.w3.org/2005/xpath-functions}count, Args:[function-call:
> vxquery:{urn:org.apache.vxquery.operators-ext}treat, Args:[function-call:
> vxquery:{http://www.w3.org/2005/xpath-functions}collection,
> Args:[function-call: vxquery:{urn:org.apache.vxquery.operators-ext}promote,
> Args:[function-call: vxquery:{http://www.w3.org/2005/xpath-functions}data,
> Args:[%0->$$1], {http://www.w3.org/2001/XMLSchema}int QUANT_ONE(bytes[5] =
> [1d00000007])]], {http://www.w3.org/2001/XMLSchema}int QUANT_ONE(bytes[5] =
> [1d000000e9])]]]
> -- ASSIGN |UNPARTITIONED|
> assign [$$1] <- [{http://www.w3.org/2001/XMLSchema}string
> QUANT_ONE(bytes[66] =
> [04003f2f55736572732f70726573746f6e6361726d616e2f446f63756d656e74732f776f726b73706163652d73766e2f776561746865722d74656e2d66696c65732f])]
> -- ASSIGN |UNPARTITIONED|
> empty-tuple-source
> -- EMPTY_TUPLE_SOURCE |UNPARTITIONED|
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