AssertionError in Calcite during planning for incremental rebuild of materialized view with aggregate on decimal column

set hive.support.concurrency=true;
set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
set hive.materializedview.rewriting.sql=false;

create table t1(a int, b decimal(7,2)) stored as orc TBLPROPERTIES ('transactional'='true');

insert into t1(a, b) values(1, 1);

create materialized view mat1 stored as orc TBLPROPERTIES ('transactional'='true') as
select t1.a, sum(t1.b) from t1
group by t1.a;

insert into t1(a,b) values(2, 5);

explain cbo alter materialized view mat1 rebuild;

java.lang.AssertionError: 
Cannot add expression of different type to set:
set type is RecordType(INTEGER $f0, DECIMAL(17, 2) $f1) NOT NULL
expression type is RecordType(INTEGER $f0, DECIMAL(18, 2) $f1) NOT NULL
set is rel#388:HiveAggregate.HIVE.[].any(input=HepRelVertex#387,group={0},agg#0=sum($1))
expression is HiveProject($f0=[$3], $f1=[CASE(IS NULL($1), $4, IS NULL($4), $1, +($4, $1))])
  HiveFilter(condition=[OR($2, IS NULL($2))])
    HiveJoin(condition=[IS NOT DISTINCT FROM($0, $3)], joinType=[right], algorithm=[none], cost=[not available])
      HiveProject(a=[$0], _c1=[$1], $f2=[true])
        HiveTableScan(table=[[default, mat1]], table:alias=[default.mat1])
      HiveAggregate(group=[{0}], agg#0=[sum($1)])
        HiveProject($f0=[$0], $f1=[$1])
          HiveFilter(condition=[<(1, $4.writeid)])
            HiveTableScan(table=[[default, t1]], table:alias=[t1])

	at org.apache.calcite.plan.RelOptUtil.verifyTypeEquivalence(RelOptUtil.java:380)
	at org.apache.calcite.plan.hep.HepRuleCall.transformTo(HepRuleCall.java:58)
	at org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:268)
	at org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:283)
	at org.apache.hadoop.hive.ql.optimizer.calcite.rules.views.HiveAggregateIncrementalRewritingRuleBase.onMatch(HiveAggregateIncrementalRewritingRuleBase.java:161)
	at org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:333)
	at org.apache.calcite.plan.hep.HepPlanner.applyRule(HepPlanner.java:542)
	at org.apache.calcite.plan.hep.HepPlanner.applyRules(HepPlanner.java:407)
	at org.apache.calcite.plan.hep.HepPlanner.executeInstruction(HepPlanner.java:243)
	at org.apache.calcite.plan.hep.HepInstruction$RuleInstance.execute(HepInstruction.java:127)
	at org.apache.calcite.plan.hep.HepPlanner.executeProgram(HepPlanner.java:202)
	at org.apache.calcite.plan.hep.HepPlanner.findBestExp(HepPlanner.java:189)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.executeProgram(CalcitePlanner.java:2468)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.executeProgram(CalcitePlanner.java:2427)
	at org.apache.hadoop.hive.ql.ddl.view.materialized.alter.rebuild.AlterMaterializedViewRebuildAnalyzer$MVRebuildCalcitePlannerAction.applyIncrementalRebuild(AlterMaterializedViewRebuildAnalyzer.java:460)
	at org.apache.hadoop.hive.ql.ddl.view.materialized.alter.rebuild.AlterMaterializedViewRebuildAnalyzer$MVRebuildCalcitePlannerAction.applyAggregateInsertIncremental(AlterMaterializedViewRebuildAnalyzer.java:352)
	at org.apache.hadoop.hive.ql.ddl.view.materialized.alter.rebuild.AlterMaterializedViewRebuildAnalyzer$MVRebuildCalcitePlannerAction.applyRecordIncrementalRebuildPlan(AlterMaterializedViewRebuildAnalyzer.java:311)
	at org.apache.hadoop.hive.ql.ddl.view.materialized.alter.rebuild.AlterMaterializedViewRebuildAnalyzer$MVRebuildCalcitePlannerAction.applyMaterializedViewRewriting(AlterMaterializedViewRebuildAnalyzer.java:278)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.apply(CalcitePlanner.java:1722)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.apply(CalcitePlanner.java:1591)
	at org.apache.calcite.tools.Frameworks.lambda$withPlanner$0(Frameworks.java:131)
	at org.apache.calcite.prepare.CalcitePrepareImpl.perform(CalcitePrepareImpl.java:914)
	at org.apache.calcite.tools.Frameworks.withPrepare(Frameworks.java:180)
	at org.apache.calcite.tools.Frameworks.withPlanner(Frameworks.java:126)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner.logicalPlan(CalcitePlanner.java:1343)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner.genOPTree(CalcitePlanner.java:570)
	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:12824)
	at org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:465)
	at org.apache.hadoop.hive.ql.ddl.view.materialized.alter.rebuild.AlterMaterializedViewRebuildAnalyzer.analyzeInternal(AlterMaterializedViewRebuildAnalyzer.java:135)
	at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:326)
	at org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:180)
	at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:326)
	at org.apache.hadoop.hive.ql.Compiler.analyze(Compiler.java:224)
	at org.apache.hadoop.hive.ql.Compiler.compile(Compiler.java:107)
	at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:519)
	at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:471)
	at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:436)
	at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:430)
	at org.apache.hadoop.hive.ql.reexec.ReExecDriver.compileAndRespond(ReExecDriver.java:121)
	at org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:227)
	at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:257)
	at org.apache.hadoop.hive.cli.CliDriver.processCmd1(CliDriver.java:201)
	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:127)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:425)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:356)
	at org.apache.hadoop.hive.ql.QTestUtil.executeClientInternal(QTestUtil.java:733)
	at org.apache.hadoop.hive.ql.QTestUtil.executeClient(QTestUtil.java:703)
	at org.apache.hadoop.hive.cli.control.CoreCliDriver.runTest(CoreCliDriver.java:115)
	at org.apache.hadoop.hive.cli.control.CliAdapter.runTest(CliAdapter.java:157)
	at org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver(TestMiniLlapLocalCliDriver.java:62)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.apache.hadoop.hive.cli.control.CliAdapter$2$1.evaluate(CliAdapter.java:135)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.apache.hadoop.hive.cli.control.CliAdapter$1$1.evaluate(CliAdapter.java:95)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:377)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:138)
	at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:465)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:451)