Volodymyr Vysotskyi created CALCITE-2026:
--------------------------------------------
Summary: AssertionError when ProjectReduceExpressionsRule
simplifies project expressions
Key: CALCITE-2026
URL: https://issues.apache.org/jira/browse/CALCITE-2026
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Volodymyr Vysotskyi
Assignee: Julian Hyde
Priority: Major
When applying ProjectReduceExpressionsRule on project which expression has a
non-nullable type, but after simplifying expression is null, the query fails
with the assertion error:
{noformat}
java.lang.AssertionError: Type mismatch:
rel rowtype:
RecordType(INTEGER EXPR$0) NOT NULL
equivRel rowtype:
RecordType(INTEGER NOT NULL EXPR$0) NOT NULL
at org.apache.calcite.util.Litmus$1.fail(Litmus.java:31)
~[calcite-core-1.13.0.jar:1.13.0]
at org.apache.calcite.plan.RelOptUtil.equal(RelOptUtil.java:1868)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoPlanner.register(VolcanoPlanner.java:855)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:883)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:1767)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoRuleCall.transformTo(VolcanoRuleCall.java:135)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:234)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.rel.rules.ReduceExpressionsRule$ProjectReduceExpressionsRule.onMatch(ReduceExpressionsRule.java:268)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:212)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:650)
~[calcite-core-1.13.0.jar:1.13.0]
at
org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:368)
~[calcite-core-1.13.0.jar:1.13.0]
{noformat}
The similar bug was described in CALCITE-1502, since there was a problem with
non-nullable and nullable types in different case branches, but this bug
appears when project expression is transformed into the expression with
nullable type.
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