Nonstop Database, HiRDB Version 9 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 Manipulating data in a table with abstract data types.
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