BUILD-SIDE SKEW HANDLING FOR JOIN OPERATIONS

BUILD-SIDE SKEW HANDLING FOR JOIN OPERATIONS

A method includes generating, by at least one hardware processor of a first computing node, a plurality of hash values using build-side row data. A frequent hash value of the plurality of hash values is detected based on row size associated with a plurality of build-side row sets including the build...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Cai, Xinzhu, Funke, Florian Andreas
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:A method includes generating, by at least one hardware processor of a first computing node, a plurality of hash values using build-side row data. A frequent hash value of the plurality of hash values is detected based on row size associated with a plurality of build-side row sets including the build-side row data. A plurality of hash partitions of the build-side row data is generated using a build-side row set of the plurality of build-side row sets that includes the frequent hash value. The plurality of hash partitions of the build-side row data is distributed to a corresponding plurality of hash-join-build (HJB) instances associated with a plurality of join operations.