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Date: Mon, 17 Nov 2014 01:41:34 +0000 (UTC)
From: "Jacques Nadeau (JIRA)" <jira@apache.org>
To: issues@drill.incubator.apache.org
Message-ID: <JIRA.12751791.1414702029000.512201.1416188494348@Atlassian.JIRA>
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 <JIRA.12751791.1414702029426@arcas>
Subject: [jira] [Updated] (DRILL-1616) Drill throws "Schema is currently
 null" error on count(field) when field is an JSON object/array
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     [ https://issues.apache.org/jira/browse/DRILL-1616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jacques Nadeau updated DRILL-1616:
----------------------------------
    Fix Version/s: 0.7.0

> Drill throws "Schema is currently null" error on count(field) when field is an JSON object/array
> ------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-1616
>                 URL: https://issues.apache.org/jira/browse/DRILL-1616
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - JSON
>            Reporter: Abhishek Girish
>            Assignee: Jason Altekruse
>             Fix For: 0.7.0
>
>
> Count(field) throws error on fields which are objects or arrays and these are not clean. They do not indicate an error in usage. Also, count on objects/arrays should be supported. 
> > select * from `abc.json`;
> +------------+------------+------------+------------+------------+
> |  field_1   |  field_2   |  field_3   |  field_4   |  field_5   |
> +------------+------------+------------+------------+------------+
> | ["1"]      | null       | {"inner_3":[]} | {"inner_1":[],"inner_3":{}} | []         |
> | ["5"]      | 2          | {"inner_1":"2","inner_3":[]} | {"inner_1":["1","2","3"],"inner_2":"3","inner_3":{"inner_object_field_1":"2"}} | [{"inner_list":["1","null","6"],"inner_ |
> | ["5","10","15"] | A wild string appears! | {"inner_1":"5","inner_2":"3","inner_3":[{},{"inner_object_field_1":"10"}]} | {"inner_1":["4","5","6"],"inner_2":"3","inner_3":{}} | [{ |
> +------------+------------+------------+------------+------------+
> 3 rows selected (0.081 seconds)
> > select count(field_1) from `abc.json`;
> Query failed: Failure while running fragment., Schema is currently null.  You must call buildSchema(SelectionVectorMode) before this container can return a schema. [ b6f021f9-213e-475e-83f4-a6facf6fd76d on abhi7.qa.lab:31010 ]
> Error: exception while executing query: Failure while executing query. (state=,code=0)
> Error is seen on fields 1,3,4,5. 
> The issue is not seen when array index is specified. 
> > select count(field_1[0]) from `abc.json`;
> +------------+
> |   EXPR$0   |
> +------------+
> | 3          |
> +------------+
> 1 row selected (0.152 seconds)
> Or when the element in the object is specified:
> > select count(t.field_3.inner_3) from `textmode.json` as t;
> +------------+
> |   EXPR$0   |
> +------------+
> | 3          |
> +------------+
> 1 row selected (0.155 seconds)
> LOG:
> 2014-10-30 13:28:20,286 [a90cc246-e60b-452b-ba96-7f79709f5ffa:frag:0:0] ERROR o.a.d.e.w.f.AbstractStatusReporter - Error bc438332-0828-4a86-8063-9dc8c5a703d9: Failure while running fragment.
> java.lang.NullPointerException: Schema is currently null.  You must call buildSchema(SelectionVectorMode) before this container can return a schema.
>         at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:208) ~[guava-14.0.1.jar:na]
>         at org.apache.drill.exec.record.VectorContainer.getSchema(VectorContainer.java:273) ~[drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at org.apache.drill.exec.record.AbstractRecordBatch.getSchema(AbstractRecordBatch.java:116) ~[drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.getSchema(IteratorValidatorBatchIterator.java:75) ~[drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.buildSchema(ScreenCreator.java:100) ~[drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:103) ~[drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:249) [drill-java-exec-0.7.0-incubating-SNAPSHOT-rebuffed.jar:0.7.0-incubating-SNAPSHOT]
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_65]
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_65]
>         at java.lang.Thread.run(Thread.java:745) [na:1.7.0_65]


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