Developing Apama Applications > Developing Apama Applications in EPL > Working with Streams and Stream Queries > Using dynamic expressions in stream queries > Understanding when the correlator evaluates particular expressions > Using dynamic expressions in where predicates
Using dynamic expressions in where predicates
The correlator evaluates the predicate in a where clause once for each item. This happens as soon as a join operation produces an item, or if there is no join operation, as soon as an item enters a window.
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