Stack function in Hive : how to specify multiple aliases?

[Mathieu Despriee]

Hi folks,

I want to use the stack function, described here :
https://cwiki.apache.org/Hive/languagemanual-udf.html#LanguageManualUDF-BuiltinTableGeneratingFunctions%2528UDTF%2529

Hive asks me to provide the multiple aliases for the resulting columns
("The number of aliases in the AS clause does not match the number of
colums output by the UDTF, expected 3 aliases but got 1").

What's the syntax to provide multiple aliases ?

Thanks,
Mathieu