Is it possible to query if the size of a collection is 0? I tried is_undefined(s.collection) but that effects a NullPointerException:
Caused by: java.lang.NullPointerException
at
org.exolab.castor.jdo.oql.ParseTreeWalker.getSQLExpr(ParseTreeWalker.
java:1247)
Best wishes... Tatjana
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