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From "weijie.tong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5913) DrillReduceAggregatesRule
Date Sat, 28 Oct 2017 12:04:00 GMT
weijie.tong created DRILL-5913:
----------------------------------

             Summary: DrillReduceAggregatesRule 
                 Key: DRILL-5913
                 URL: https://issues.apache.org/jira/browse/DRILL-5913
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
    Affects Versions: 1.11.0, 1.9.0
            Reporter: weijie.tong


sample query:
{code:java}
select stddev_samp(cast(employee_id as int)) as col1, sum(cast(employee_id as int)) as col2
from cp.`employee.json`
{code}

error info:

{code:java}

org.apache.drill.exec.rpc.RpcException: org.apache.drill.common.exceptions.UserRemoteException:
SYSTEM ERROR: AssertionError: Type mismatch:
rel rowtype:
RecordType(INTEGER $f0, INTEGER $f1, BIGINT NOT NULL $f2, INTEGER $f3) NOT NULL
equivRel rowtype:
RecordType(INTEGER $f0, INTEGER $f1, BIGINT NOT NULL $f2, BIGINT $f3) NOT NULL
[Error Id: f5114e62-a57b-46b1-afe8-ae652f390896 on localhost:31010]
  (org.apache.drill.exec.work.foreman.ForemanException) Unexpected exception during fragment
initialization: Internal error: Error while applying rule DrillReduceAggregatesRule, args
[rel#29:LogicalAggregate.NONE.ANY([]).[](input=rel#28:Subset#3.NONE.ANY([]).[],group={},agg#0=SUM($1),agg#1=SUM($0),agg#2=COUNT($0),agg#3=$SUM0($0))]
    org.apache.drill.exec.work.foreman.Foreman.run():294
    java.util.concurrent.ThreadPoolExecutor.runWorker():1142
    java.util.concurrent.ThreadPoolExecutor$Worker.run():617
    java.lang.Thread.run():745
  Caused By (java.lang.AssertionError) Internal error: Error while applying rule DrillReduceAggregatesRule,
args [rel#29:LogicalAggregate.NONE.ANY([]).[](input=rel#28:Subset#3.NONE.ANY([]).[],group={},agg#0=SUM($1),agg#1=SUM($0),agg#2=COUNT($0),agg#3=$SUM0($0))]
    org.apache.calcite.util.Util.newInternal():792
    org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch():251
    org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp():811
{code}


The reason is that stddev_samp(cast(employee_id as int))  will be reduced as sum($0) ,sum($1)
,count($0) while the sum(cast(employee_id as int)) will be reduced as sum0($0) by the DrillReduceAggregatesRule's
first time matching.  The second time's matching will reduce stddev_samp's sum($0) to sum0($0)
too . But this sum0($0) 's data type is different from the first time's sum0($0) : one is
integer ,the other is bigint . But Calcite's addAggCall method treat them as the same by ignoring
their data type. This leads to the bigint sum0($0) be replaced by the integer sum0($0).



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