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https://issues.apache.org/jira/browse/CALCITE-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruben Quesada Lopez updated CALCITE-3376:
-----------------------------------------
Attachment: logsTRACE.txt
> VolcanoPlanner CannotPlanException: best rel is null even though there is an
> option with non-infinite cost
> ----------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-3376
> URL: https://issues.apache.org/jira/browse/CALCITE-3376
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.21.0
> Reporter: Ruben Quesada Lopez
> Priority: Major
> Attachments: Graphviz.png, logsTRACE.txt, stackTrace.txt
>
>
> The problem can be reproduced by adding this test to PlannerTest.java:
> {code:java}
> @Test public void testCannotPlanException() throws Exception {
> RelBuilder builder = RelBuilder.create(RelBuilderTest.config().build());
> RuleSet ruleSet =
> RuleSets.ofList(
> //EnumerableRules.ENUMERABLE_JOIN_RULE, // with this rule it
> works!
> JoinToCorrelateRule.INSTANCE,
> EnumerableRules.ENUMERABLE_CORRELATE_RULE,
> EnumerableRules.ENUMERABLE_PROJECT_RULE,
> EnumerableRules.ENUMERABLE_FILTER_RULE,
> EnumerableRules.ENUMERABLE_SORT_RULE,
> EnumerableRules.ENUMERABLE_UNION_RULE,
> EnumerableRules.ENUMERABLE_TABLE_SCAN_RULE);
> builder
> .scan("EMP")
> .scan("EMP")
> .union(true)
> .scan("EMP")
> .scan("EMP")
> .union(true)
> .join(
> JoinRelType.INNER,
> builder.equals(
> builder.field(2, 0, "DEPTNO"),
> builder.field(2, 1, "EMPNO")));
> RelNode relNode = builder.build();
> RelOptPlanner planner = relNode.getCluster().getPlanner();
> Program program = Programs.of(ruleSet);
> RelTraitSet toTraits = relNode.getTraitSet()
> .replace(EnumerableConvention.INSTANCE);
> RelNode output = program.run(planner, relNode, toTraits,
> ImmutableList.of(), ImmutableList.of());
> String outputStr = toString(output);
> }
> {code}
> Running this test causes the following exception (full stack trace attached):
> {code:java}
> org.apache.calcite.plan.RelOptPlanner$CannotPlanException: There are not
> enough rules to produce a node with desired properties:
> convention=ENUMERABLE, sort=[]. All the inputs have relevant nodes, however
> the cost is still infinite.
> Root: rel#13:Subset#2.ENUMERABLE.[]
> {code}
> The last part of the message (_All the inputs have relevant nodes, however
> the cost is still infinite_) seems relevant, because we can see that
> {{rel#13}}'s best is {{null}}, and it should be {{rel#21}} (which has a
> non-infinite cost):
> {code:java}
> rel#13:Subset#2.ENUMERABLE.[], best=null, importance=1.0
> rel#14:AbstractConverter.ENUMERABLE.[](input=RelSubset#12,
> convention=ENUMERABLE, sort=[]), rowcount=117.6, cumulative cost={inf}
> rel#21:EnumerableCorrelate.ENUMERABLE.[](left=RelSubset#19,
> right=RelSubset#20, correlation=$cor0, joinType=inner, requiredColumns={7}),
> rowcount=1.0, cumulative cost={1770.6000000000001 rows, 2466.0 cpu, 0.0 io}
> {code}
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