Sort all valid elements according to a list of attribute values.
Parameter
attributes
: The list of attribute names to use for sortingascending:
Optional boolean values that flags, if the given list of attributes should be sorted in ascending or descending order. Default value is descending.
Note: Because of the non-decreasing order of time in a data stream sorting is only possible inside a relation with equal start and end timestamp.Output is only created after an element is read with a higher start time stamp than the highest end timestamp!
Example
PQL
Sort Operator
relation = ELEMENTWINDOW({SLIDE = 5, SIZE=5}, input) /// Sort the stream by the attribute value id. output = SORT({ attributes = ['id'] }, relation) /// Sort the stream by the attribute id in ascending order. output = SORT({ attributes = ['id'], ascending = ['true'] }, relation)