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Haisheng Yuan edited comment on CALCITE-2812 at 6/1/19 5:32 PM: ---------------------------------------------------------------- Looks like it is maven-surefire-plugin's issue. I changed surefire.threadCount in pom.xml from 1 to 4, and the tests passed successfully. There are also others reporting the hung issue since Surefire 2.19.1: https://issues.apache.org/jira/browse/SUREFIRE-1255, which is still open. We are using 2.22.0. Also this: https://issues.apache.org/jira/browse/SUREFIRE-1430 was (Author: hyuan): Looks like it is maven-surefire-plugin's issue. I changed surefire.threadCount in pom.xml from 1 to 4, and the tests passed successfully. There are also others reporting the hung issue since Surefire 2.19.1: https://issues.apache.org/jira/browse/SUREFIRE-1255, which is still open. We are using 2.22.0. > Add algebraic operators to allow expressing recursive queries > ------------------------------------------------------------- > > Key: CALCITE-2812 > URL: https://issues.apache.org/jira/browse/CALCITE-2812 > Project: Calcite > Issue Type: New Feature > Components: core > Affects Versions: 1.18.0 > Reporter: Stamatis Zampetakis > Assignee: Ruben Quesada Lopez > Priority: Major > Labels: pull-request-available > Fix For: 1.20.0 > > Time Spent: 10h > Remaining Estimate: 0h > > In order to parse, optimize, and execute, recursive queries, expressed in > SQL, datalog, SPARQL, or other high level language we need first to be able > to represent recursive queries in relational algebra. > The subject has been previously discussed in the dev list (see thread with > title [Recursive query, graph query, > Datalog|http://mail-archives.apache.org/mod_mbox/calcite-dev/201712.mbox/%3CCAPSgeESFyih9_hf9=uMWFN00BCR7sjf0T+FRY2=ary3ygm1...@mail.gmail.com%3E]) > where various ideas and optimizations were proposed. > In this issue, we attempt to address only the algebraic part providing the > following: > # logical operator(s) for expressing recursion; > # naive physical operator(s) for the Enumerable convention; > # ability to create a recusive plan using the RelBuilder. -- This message was sent by Atlassian JIRA (v7.6.3#76005)