Snowflake Inc.
MAINTAINING STATES OF PARTITIONS OF A TABLE FOR RECLUSTERING

Abstract:

The subject technology creates partitions based on changes to a table, at least one of the one or more partitions overlapping with respect to values of one or more attributes with at least one of another partition and a previous partition. The subject technology maintains states for the partitions, each state from the plurality of states representing a particular degree of clustering of the table. The subject technology determines a number of overlapping partitions and a depth of the overlapping partitions, and determines a clustering ratio based at least n part on the number of overlapping partitions and the depth. The subject technology reclusters partitions of the table to increase the clustering ratio, the clustering ratio determined by at least a proportion of rows in a layout of the table that satisfy an ordering criteria based at least in part a particular attribute of the one or more attributes.