Scalable Database Server, HiRDB Version 8 UAP Development Guide
If the result of a function defined by an abstract data type or the result of a user-defined function is a Boolean value (TRUE, FALSE, or UNKNOWN), use a Boolean predicate for the true/false decision. For details about data retrieval strings that use a Boolean predicate, see 2.12.1 Abstract data types provided by the HiRDB Text Search Plug-in.
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