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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!
So in the following example, output is created after reading the last "a"-value.
a [0,10] --> no output
c [0,10] --> no output
b [0,10] --> no output
a [10,20] --> Output of three tuples a [0,10], b [0,10], c [0,10]
Example
PQL
Code Block | ||||||||||
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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) |