April 2016
Beginner
268 pages
5h 32m
English
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Windowing in Hive
Windowing in Hive allows an analyst to create a window of data to operate aggregation and other analytical functions, such as LEAD and LAG.
The windowing specification in HiveQL comprises:
- Partition
- Order by
- Window frame
- Source name for window definition
Let's look into each of these specifications in detail:
- Partition specification: It includes a column reference from the table. It could not be any aggregation or other window specification.
- Order specification: It comprises a combination of one or more columns. The ordering could be
ASCorDESC, which by default isASC.Handling NULLs: There is no support for
Nullsfirst or last specification. In Hive, Nulls are returned first. - Window frame: A frame has a start boundary and an optional ...
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