Document CREATE FUNCTION (user-defined functions) #3778
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Add comprehensive documentation for user-defined functions including: - CREATE FUNCTION syntax with parameters and DEFAULT values - Named vs positional parameter calling - Calling without parentheses (when all params have defaults) - Functions in JOINs, subqueries, and nested calls
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Adds CREATE FUNCTION documentation with syntax, parameters, DEFAULT values, and examples. All examples tested in udf-documentation-queries.yamsql.