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Data processing method and device, electronic equipment and computer storage medium

A data processing and data table technology, applied in the computer field, can solve problems such as high overhead, achieve the effect of reducing overhead, avoiding full table scan, and reducing query time

Pending Publication Date: 2021-09-21
ALIBABA GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unconditional connection of two data tables usually requires a full table scan, which is very expensive

Method used

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  • Data processing method and device, electronic equipment and computer storage medium
  • Data processing method and device, electronic equipment and computer storage medium
  • Data processing method and device, electronic equipment and computer storage medium

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Embodiment Construction

[0025] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the embodiments of the present invention shall fall within the protection scope of the embodiments of the present invention.

[0026] The specific implementation of the embodiments of the present invention will be further described below in conjunction with the accompanying drawings of the embodiments of the present invention.

[0027] Currently, when performing join table query, the join table (ie, join) calculation...

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Abstract

The embodiment of the invention provides a data processing method and device, electronic equipment and a computer storage medium. According to the scheme provided by the embodiment of the invention, during linked table query, a filtering condition operator of linked table query is converted into a conjunctive normal form composed of N expressions capable of being pushed down, and the expressions capable of being pushed down represent expressions executed before a data table is connected with a join operator. According to the N sub-query tasks corresponding to the N expressions capable of being pushed down, the N sub-query tasks are processed to obtain N query sub-tables; and the N query sub-tables are combined to generate a query result. Through equivalent conversion of the expression of the filtering condition operator, filtering is executed before data table connection, full table scanning is avoided, data scanning overhead is greatly reduced, and query time is shortened.

Description

technical field [0001] The embodiments of the present invention relate to the field of computer technology, and in particular, to a data processing method, device, electronic equipment, and computer storage medium. Background technique [0002] With the development of database technology, more and more applications require fast query function based on database. In data query, joint table query is often required, that is, multiple data tables need to be combined to obtain the required data. In the joint table query, since the filter condition usually involves at least two data tables at the same time, this means that the filter (filter) must be performed after the join operator is executed. That is, it is necessary to output the results of the connection of the two data tables first, and then filter out the data to be queried on top of this output. The unconditional connection of two data tables usually requires a full table scan, which is very expensive. [0003] Based on...

Claims

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Application Information

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IPC IPC(8): G06F16/22G06F16/242G06F16/245
CPCG06F16/2282G06F16/2433G06F16/245
Inventor 郭泽晖
Owner ALIBABA GRP HLDG LTD
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