Mihai Budiu created CALCITE-6349:
------------------------------------

             Summary: CoreRules.PROJECT_REDUCE_EXPRESSIONS crashes on 
expression with ARRAY_REPEAT
                 Key: CALCITE-6349
                 URL: https://issues.apache.org/jira/browse/CALCITE-6349
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.36.0
            Reporter: Mihai Budiu


The following test in RelOptRulesTest causes a crash:

{code:java}
  @Test void testArrayRepeat() {
    final String sql = "select array_repeat(1, null)";
    sql(sql)
        .withFactory(
            t -> t.withOperatorTable(
                opTab -> 
SqlLibraryOperatorTableFactory.INSTANCE.getOperatorTable(
                    SqlLibrary.STANDARD, SqlLibrary.SPARK)))
        .withRule(CoreRules.PROJECT_REDUCE_EXPRESSIONS)
        .check();
  }
{code}

The crash is:

{code:java}
java.lang.AssertionError: Cannot add expression of different type to set:
set type is RecordType(INTEGER NOT NULL ARRAY NOT NULL EXPR$0) NOT NULL
expression type is RecordType(INTEGER NOT NULL ARRAY EXPR$0) NOT NULL
set is rel#4:LogicalProject.(input=HepRelVertex#3,exprs=[ARRAY_REPEAT(1, 
null:DECIMAL(19, 9))])
expression is LogicalProject(EXPR$0=[null:INTEGER NOT NULL ARRAY])
  LogicalValues(tuples=[[{ 0 }]])
Type mismatch:
rowtype of original rel: RecordType(INTEGER NOT NULL ARRAY NOT NULL EXPR$0) NOT 
NULL
rowtype of new rel: RecordType(INTEGER NOT NULL ARRAY EXPR$0) NOT NULL
Difference:
EXPR$0: INTEGER NOT NULL ARRAY NOT NULL -> INTEGER NOT NULL ARRAY

        at 
org.apache.calcite.plan.RelOptUtil.verifyTypeEquivalence(RelOptUtil.java:419)
        at 
org.apache.calcite.plan.hep.HepRuleCall.transformTo(HepRuleCall.java:60)
        at 
org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:273)
        at 
org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:288)
        at 
org.apache.calcite.rel.rules.ReduceExpressionsRule$ProjectReduceExpressionsRule.onMatch(ReduceExpressionsRule.java:317)
        at 
org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:337)
{code}



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