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Stamatis Zampetakis resolved HIVE-28252. ---------------------------------------- Fix Version/s: 4.1.0 Resolution: Fixed Fixed in https://github.com/apache/hive/commit/0e84fe2000c026afd0a49f4e7c7dd5f54fe7b1ec. Thanks for the review [~kkasa]! > AssertionError when using HiveTableScan with a HepPlanner cluster > ----------------------------------------------------------------- > > Key: HIVE-28252 > URL: https://issues.apache.org/jira/browse/HIVE-28252 > Project: Hive > Issue Type: Improvement > Components: CBO, Tests > Affects Versions: 4.0.0 > Reporter: Stamatis Zampetakis > Assignee: Stamatis Zampetakis > Priority: Major > Labels: pull-request-available > Fix For: 4.1.0 > > > The {{HiveTableScan}} operator throws an > [AssertionError|https://github.com/apache/hive/blob/7950967eae9640fcc0aa22f4b6c7906b34281eac/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveTableScan.java#L153] > if the operator does not have the {{HiveRelNode.CONVENTION}} set. > The {{HepPlanner}} does not use any > [RelTraitDef|https://github.com/apache/calcite/blob/f854ef5ee480e0ff893b18d27ec67dc381ee2244/core/src/main/java/org/apache/calcite/plan/AbstractRelOptPlanner.java#L276] > so the default [empty traitset for the respective > cluster|https://github.com/apache/calcite/blob/f854ef5ee480e0ff893b18d27ec67dc381ee2244/core/src/main/java/org/apache/calcite/plan/RelOptCluster.java#L99] > is gonna be always empty. > In principle we should not be able to use the {{HiveTableScan}} operator with > {{HepPlanner}}. However, the optimizer heavily uses the {{HepPlanner}} (in > fact more than the {{VolcanoPlanner}} and it is reasonable to wonder how is > this possible given that this assertion is in place. The assertion is > circumvented by creating a cluster from a > [VolcanoPlanner|https://github.com/apache/hive/blob/7950967eae9640fcc0aa22f4b6c7906b34281eac/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L1620] > and then using it in the > [HepPlanner|https://github.com/apache/hive/blob/7950967eae9640fcc0aa22f4b6c7906b34281eac/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L2422]. > > This cluster usage is a bit contrived but does not necessarily need to change > at this stage. > Nevertheless, since the {{HiveTableScan}} operator is suitable to run with > the {{HepPlanner}} the assertion can be relaxed (or removed altogether) to > better reflect the actual usage of the operator, and allow passing a "true" > HepPlanner cluster inside the operator. -- This message was sent by Atlassian Jira (v8.20.10#820010)