发明申请
- 专利标题： AVOIDING THREE-VALUED LOGIC IN PREDICATES ON DICTIONARY-ENCODED DATA
- 专利标题（中）： 避免在编码数据上预测三值逻辑
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申请号： US13544583申请日： 2012-07-09
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公开(公告)号： US20120278291A1公开(公告)日： 2012-11-01
- 发明人: Peter Bendel , Oliver Draese , Vijayshankar Raman , Knut Stolze
- 申请人： Peter Bendel , Oliver Draese , Vijayshankar Raman , Knut Stolze
- 申请人地址： US NY Armonk
- 专利权人： INTERNATIONAL BUSINESS MACHINES CORPORATION
- 当前专利权人： INTERNATIONAL BUSINESS MACHINES CORPORATION
- 当前专利权人地址： US NY Armonk
- 主分类号： G06F17/30
- IPC分类号： G06F17/30
摘要：
According to one embodiment of the present invention, a method for dictionary encoding data without using three-valued logic is provided. According to one embodiment of the invention, a method includes encoding data in a database table using a dictionary, wherein the data includes values representing NULLs. A query having a predicate is received and the predicate is evaluated on the encoded data, whereby the predicate is evaluated on both the encoded data and on the encoded NULLs.
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