[CALCITE-2108] AggregateJoinTransposeRule fails when process aggregateCall above SqlSumEmptyIsZeroAggFunction without groupKeys

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.16.0
• Assignee: Julian Hyde
• Reporter: Jing Zhang
• Created: 23/Dec/17 03:38
• Updated: 27/Jan/22 18:10
• Resolved: 26/Dec/17 23:58

Description

   final HepProgram preProgram = new HepProgramBuilder()
            .addRuleInstance(AggregateProjectMergeRule.INSTANCE)
            .build();
    final HepProgram program = new HepProgramBuilder()
            .addRuleInstance(AggregateReduceFunctionsRule.INSTANCE)
            .addRuleInstance(AggregateJoinTransposeRule.EXTENDED)
            .build();
    final String sql = "select sum(sal)\n"
            + "from (select * from sales.emp where empno = 10) as e\n"
            + "join sales.dept as d on e.job = d.name";

AggregateJoinTransposeRule fails when run the above sql, the exception is as following.

java.lang.AssertionError: type mismatch:
aggCall type:
INTEGER NOT NULL
inferred type:
INTEGER

	at org.apache.calcite.util.Litmus$1.fail(Litmus.java:31)
	at org.apache.calcite.plan.RelOptUtil.eq(RelOptUtil.java:1838)
	at org.apache.calcite.rel.core.Aggregate.typeMatchesInferred(Aggregate.java:428)
	at org.apache.calcite.rel.core.Aggregate.<init>(Aggregate.java:161)
	at org.apache.calcite.rel.logical.LogicalAggregate.<init>(LogicalAggregate.java:65)
	at org.apache.calcite.rel.logical.LogicalAggregate.create_(LogicalAggregate.java:110)
	at org.apache.calcite.rel.logical.LogicalAggregate.create(LogicalAggregate.java:100)
	at org.apache.calcite.rel.core.RelFactories$AggregateFactoryImpl.createAggregate(RelFactories.java:213)
	at org.apache.calcite.tools.RelBuilder.aggregate(RelBuilder.java:1267)
	at org.apache.calcite.tools.RelBuilder.aggregate(RelBuilder.java:1825)
	at org.apache.calcite.rel.rules.AggregateJoinTransposeRule.onMatch(AggregateJoinTransposeRule.java:337)

Notes: This is different with the issue referred in https://issues.apache.org/jira/browse/CALCITE-2105. This question caused by the SqlSplittableAggFunction of SqlSumEmptyIsZeroAggFunction is SumSplitter. If groupByKeys is empty, the aggregateCalls returnTypes of Sum is nullable, while the returnTypes of Sum0 is not nullable.

Issue Links

• relates to: CALCITE-2105 AggregateJoinTransposeRule fails when process aggregate without group keys