Method and apparatus to support bitmap filtering in a parallel system
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United States of America Patent
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Mar 27, 2012
Grant Date -
Jun 1, 2006
app pub date -
Nov 30, 2004
filing date -
Nov 30, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are described for combining pieces of information from two sources. The techniques may be used to improve the performance, for example, of hash join operations that are parallelized using slaves distributed across multiple nodes. According to one technique, bitmap filtering operations are performed by the probe-phase producer slaves, rather than the probe-phase consumer slaves. To avoid having to merge separately built bitmap filter chunks, the left-hand rows may be sent to every probe-phase consumer slave. Alternatively, the merge operation may be avoided by distributing the rows of one source based on how the other source has been statically partitioned.
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