>>>> 2012/11/04 22:23 +0000, Stefan Kuhn >>>> select * from table order by udf(column, 'input_value') desc; For my understanding, this should give the same result always. <<<<<<<< But if for your data function "udf" returns the same for more arguments there is not enough to fix the order. In that case I have found that other accidental things affect the order, things that one would not suspect: howmuch store is used and needed for the ordering, ... a further reason for showing what the function returns. If the order varies, although the function returns the same in all cases, well, ....
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