Answer / aditya

is_defined : Tests whether an expression results in a non-
NULL value.

Syn :long is_defined(expr)


is_null :Tests whether an expression results in a NULL
value.

Syntax : long is_null(expr)



is_blank : Tests whether a string contains only blank
characters.

Syntax : long is_blank(string str)

i have a scenario where i need to change the value of a sort order in my sort component whether ascending or descending depend on some input value... e.g if input_val = A then sort order should be ascending else descending I have to use PDL in this... Can you please tell me where do i have to make this change and how ?

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