[ https://issues.apache.org/jira/browse/CALCITE-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916465#comment-16916465 ]
Danny Chan commented on CALCITE-2973: ------------------------------------- CALCITE-2302 and CALCITE-1581 are almost ready to be merged, i think it's okey to push this patch into release-1.21 if you think it is in enough good shape. > Allow theta joins that have equi conditions to be executed using a hash join > algorithm > -------------------------------------------------------------------------------------- > > Key: CALCITE-2973 > URL: https://issues.apache.org/jira/browse/CALCITE-2973 > Project: Calcite > Issue Type: New Feature > Components: core > Affects Versions: 1.19.0 > Reporter: Lai Zhou > Priority: Minor > Labels: pull-request-available > Time Spent: 8h 20m > Remaining Estimate: 0h > > Now the EnumerableMergeJoinRule only supports an inner and equi join. > If users make a theta-join query for a large dataset (such as 10000*10000), > the nested-loop join process will take dozens of time than the sort-merge > join process . > So if we can apply merge-join or hash-join rule for a theta join, it will > improve the performance greatly. -- This message was sent by Atlassian Jira (v8.3.2#803003)