Joel Bernstein created SOLR-13560:
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             Summary: Add isNull and notNull Stream Evaluators
                 Key: SOLR-13560
                 URL: https://issues.apache.org/jira/browse/SOLR-13560
             Project: Solr
          Issue Type: New Feature
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Joel Bernstein


This ticket adds two Stream Evaluators for testing for null values in Tuples. 
These are much needed functions as currently null values are not possible to 
detect with the *eq* Stream Evaluator because null values are evaluated to the 
variable name, rather then null. This change was made to support String 
literals without quotes.

The isNull and notNull Stream Evaluators properly detect nulls so they can be 
used to filter tuples in a *having* expression or replace nulls in a *select* 
expression.



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