Support for "ESCAPE" in EJBQL
-----------------------------

                 Key: CAY-1426
                 URL: https://issues.apache.org/jira/browse/CAY-1426
             Project: Cayenne
          Issue Type: Improvement
          Components: Core Library
    Affects Versions: 3.0RC3
            Reporter: Andrew Lindesay
            Priority: Minor


The EJBQL specification allows for an escape character to be supplied for the 
generated SQL.  For example, the following would be valid;

...WHERE (((r.applicableTimestamp>=?1) AND (r.applicableTimestamp<?2)) AND 
(UPPER(r.message) LIKE ?3 ESCAPE '|')) ORDER...

The EJBQL parser is presently failing;

        ... 70 more
Caused by: org.apache.cayenne.ejbql.parser.ParseException: Encountered " 
"ESCAPE" "ESCAPE "" at line 1, column 130.
Was expecting:
    ")" ...
    
        at 
org.apache.cayenne.ejbql.parser.EJBQL.generateParseException(EJBQL.java:9419)

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