Support for user defined aggregations in a data stream management system
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United States of America Patent
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Jun 19, 2012
Grant Date -
Nov 3, 2011
app pub date -
Jul 16, 2011
filing date -
Oct 20, 2007
priority date (Note) -
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Abstract
A computer is programmed to accept a command to create a new aggregation defined by a user during execution of continuous queries on streams of data. The computer is further programmed to thereafter accept and process new continuous queries using the new aggregation, in a manner similar to built-in aggregations. The user typically writes a set of instructions to perform the new aggregation, and identifies in the command, a location of the set of instructions. In response to such a command, the computer creates metadata identifying the new aggregation. The metadata is used to instantiate one aggregation for each group of data in a current window, grouped by an attribute identified in a new query.
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