Method for query optimization in distributed query engine and apparatus thereof

摘要

Embodiments of the present invention relate to a method and apparatus for optimizing a query in a distributed query engine. A query optimization method according to an embodiment of the present invention includes a step of establishing a query plan based on a query; a step of classifying data, which is to be included in the result data of an upper operation among the result data of a lower operation, into first data used for intermediate operations existing between the lower operation and the upper operation and second data that is not used for the intermediate operations on the basis of the established query plan; and a step of modifying the query plan such that the second data is not an input value for the intermediate operations. According to the embodiments of the present invention, it is possible to reduce the amount of data redistributed in the query process.