From b14b78f0d5c49ab78a6bd95a32bca5c8eb79d31c Mon Sep 17 00:00:00 2001
From: Florin Akermann The join will be triggered under the conditions listed below whenever new input is received. When it is triggered, the user-supplied
ValueJoiner
will be called to produce
join output records.
--
-- Input records with a
-null
key or anull
value are ignored and do not trigger the join.
See the semantics overview at the bottom of this section for a detailed description.