[ https://issues.apache.org/jira/browse/CALCITE-2979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ruben Quesada Lopez reassigned CALCITE-2979: -------------------------------------------- Assignee: Ruben Quesada Lopez (was: Khawla Mouhoubi) > Add a batch-based nested loop join algorithm > -------------------------------------------- > > Key: CALCITE-2979 > URL: https://issues.apache.org/jira/browse/CALCITE-2979 > Project: Calcite > Issue Type: Improvement > Components: core > Affects Versions: 1.19.0 > Reporter: Stamatis Zampetakis > Assignee: Ruben Quesada Lopez > Priority: Major > Labels: performance, pull-request-available > Fix For: 1.21.0 > > Time Spent: 2h 20m > Remaining Estimate: 0h > > Currently, Calcite provides a tuple-based nested loop join algorithm > implemented through EnumerableCorrelate and EnumerableDefaults.correlateJoin. > This means that for each tuple of the outer relation we probe (set variables) > in the inner relation. > The goal of this issue is to add new algorithm (or extend the correlateJoin > method) which first gathers blocks (batches) of tuples from the outer > relation and then probes the inner relation once per block. > There are cases (eg., indexes) where the inner relation can be accessed by > more than one value which can greatly improve the performance in particular > when the outer relation is big. -- This message was sent by Atlassian Jira (v8.3.2#803003)