tumbling window and db:add in same expression - BaseX-Talk - mailman.uni-konstanz.de

29 Jan 2016


      Hello all,
BaseX doesn't seem to like the query below. Any particular reason - it makes sense to me. I'm trying to add items to a DB incrementally to (attempt to) avoid running into out of memory exceptions when cutting a slice of a large DB into a smaller one.
for tumbling window $w in db:open(myDB')//ani:ref-authors/ani:author
start at $s when $s mod 50000 = 1
return
 db:add(
   'sliceDB',
   <index>{$w}</index>,
   'somepath.xml'
 )
Improper use? Potential bug? Your feedback is welcome:
Contact: basex-talk@mailman.uni-konstanz.de
Version: BaseX 8.3
Java: Oracle Corporation, 1.8.0_40
OS: Windows 7, amd64
Stack Trace:
java.lang.NullPointerException
                at org.basex.query.expr.ParseExpr.checkAllUp(ParseExpr.java:219)
                at org.basex.query.expr.ParseExpr.checkNoneUp(ParseExpr.java:203)
                at org.basex.query.expr.gflwor.Window.checkUp(Window.java:341)
                at org.basex.query.expr.gflwor.GFLWOR.checkUp(GFLWOR.java:791)
                at org.basex.query.QueryContext.check(QueryContext.java:265)
                at org.basex.query.QueryParser.finish(QueryParser.java:279)
                at org.basex.query.QueryParser.parseMain(QueryParser.java:176)
                at org.basex.query.QueryContext.parseMain(QueryContext.java:221)
                at org.basex.query.QueryProcessor.parse(QueryProcessor.java:56)
                at org.basex.core.cmd.AQuery.parse(AQuery.java:144)
                at org.basex.core.cmd.AQuery.updating(AQuery.java:158)
                at org.basex.core.cmd.AQuery.updating(AQuery.java:288)
                at org.basex.gui.GUI.exec(GUI.java:458)
                at org.basex.gui.GUI.access$400(GUI.java:43)
                at org.basex.gui.GUI$7.run(GUI.java:412)
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