Public bug reported: If a FLWOR has a sequential return clause, all of the binding sequences of the clauses are materialized before the return clause is executed. This behavior is correct according to the latest Scripting specification and avoids confusion if the return clause would modify any input to one of the clauses.
However, the downside is that there is currently no way to stream the input. For example, in the following query, $contents is completely materialized before the sequential local:test function is invoked. variable $xmlcontents := fetch:content("big-file.xml"); let $contents := parse-xml:parse( $xmlcontents, <opt:options> <opt:parse-external-parsed-entity opt:skip-root-nodes="1" /> </opt:options>) for $w at $pos in $contents return { local:test(); $w } There has been an extensive discussion on zorba-dev (subject "Streaming and Sequential FLWOR -> no good") on this topic but no satisfying solution has been found, yet. ** Affects: zorba Importance: High Status: New -- You received this bug notification because you are a member of Zorba Coders, which is the registrant for Zorba. https://bugs.launchpad.net/bugs/1026250 Title: streaming and sequential flwor Status in Zorba - The XQuery Processor: New Bug description: If a FLWOR has a sequential return clause, all of the binding sequences of the clauses are materialized before the return clause is executed. This behavior is correct according to the latest Scripting specification and avoids confusion if the return clause would modify any input to one of the clauses. However, the downside is that there is currently no way to stream the input. For example, in the following query, $contents is completely materialized before the sequential local:test function is invoked. variable $xmlcontents := fetch:content("big-file.xml"); let $contents := parse-xml:parse( $xmlcontents, <opt:options> <opt:parse-external-parsed-entity opt:skip-root-nodes="1" /> </opt:options>) for $w at $pos in $contents return { local:test(); $w } There has been an extensive discussion on zorba-dev (subject "Streaming and Sequential FLWOR -> no good") on this topic but no satisfying solution has been found, yet. To manage notifications about this bug go to: https://bugs.launchpad.net/zorba/+bug/1026250/+subscriptions -- Mailing list: https://launchpad.net/~zorba-coders Post to : zorba-coders@lists.launchpad.net Unsubscribe : https://launchpad.net/~zorba-coders More help : https://help.launchpad.net/ListHelp