[FRG-30] enhance ITERATOR calling convention to allow Java iterators to receive a notification on cursor close

[dynamobi-build]

[reporter="jvs", created="Fri, 27 Jan 2006 19:59:39 -0500 (GMT-05:00)"]
This would be similar to the way we already added the RestartableIterator extension. Without this, iterators like FarragoJavaUdxIterator have to go through contortions in order to avoid becoming resource leaks.

[dynamobi-build]

[author="jvs", created="Sat, 11 Feb 2006 15:31:23 -0500 (GMT-05:00)"]
Also support propagation of special "YIELD_ROW" objects which would allow Java iterators to be properly scheduled as ExecStreams.

[dynamobi-build]

[author="jvs", created="Fri, 2 Feb 2007 02:08:34 -0500 (GMT-05:00)"]
Stephan already took care of the yield part, but the close part still remains to be fixed. In particular, currently when a UDX is closed without the client draining all of its results, it sees an abort and posts an exception, which is confusing.

[dynamobi-build]

[author="jvs", created="Sat, 17 May 2008 21:41:32 -0500 (GMT-05:00)"]
See also FRG-320.