eval-functions-num-classes.md
An integer > 1, specifies the number of classes to pass to the function.
You must set this parameter if the specified input columns are of type CHAR/VARCHAR. Otherwise, the function processes this parameter according to the column data types:
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INTEGER: By default set to 2, you must set this parameter correctly if the number of classes is any other value.
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BOOLEAN: By default set to 2, cannot be set to any other value.