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Revision 2722

Added by Aaron Marcuse-Kubitza over 12 years ago

schemas/functions.sql: _nullIf(): Ignore uncastable value, because a value that's invalid for the given type is still well-defined as not matching the nullif() criterion

View differences:

schemas/functions.sql
110 110 
BEGIN
111 111 
    IF new.type = 'str' THEN -- no cast needed
112 112 
        new.result := (SELECT nullif(new.value, new."null"));
113 
    -- Invalid value -> warning, but invalid null value -> error
113 
    -- Invalid value is ignored, but invalid null value generates error
114 114 
    ELSIF new.type = 'float' THEN
115 
        new.result := (SELECT nullif(functions."double precision"(new.value),
116 
            new."null"::double precision));
115 
        DECLARE
116 
            -- Outside the try block so that invalid null value generates error
117 
            "null" double precision := new."null"::double precision;
118 
        BEGIN
119 
            new.result := (SELECT nullif(new.value::double precision, "null"));
120 
        EXCEPTION
121 
            WHEN data_exception THEN NULL; -- ignore invalid value
122 
        END;
117 123 
    END IF;
118 124
119 125 
    RETURN new;

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