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https://issues.apache.org/jira/browse/HIVE-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14876245#comment-14876245
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Yongzhi Chen commented on HIVE-11827:
-------------------------------------
[~xuefuz], as in the AvroSerDe.initialize, we can getSchemaFromCols
This fix just works the similar way as in the initialize method.
> STORED AS AVRO fails SELECT COUNT(*) when empty
> -----------------------------------------------
>
> Key: HIVE-11827
> URL: https://issues.apache.org/jira/browse/HIVE-11827
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Environment: CDH5.4.5
> Reporter: Johndee Burks
> Assignee: Yongzhi Chen
> Priority: Minor
> Attachments: HIVE-11827.1.patch
>
>
> If you create a table stored as avro and try to do select count(*) against
> the table it will fail. The following shows this. Empty table in this
> situation is a table with no files.
> {code}
> hive> create table j2 (a int) stored as avro;
> OK
> Time taken: 1.069 seconds
> hive> select count(*) from j2;
> Query ID = johndee_20150915113434_d4fe99d4-7fb9-42fe-9b91-ad560eeacc48
> Total jobs = 1
> Launching Job 1 out of 1
> Number of reduce tasks determined at compile time: 1
> In order to change the average load for a reducer (in bytes):
> set hive.exec.reducers.bytes.per.reducer=<number>
> In order to limit the maximum number of reducers:
> set hive.exec.reducers.max=<number>
> In order to set a constant number of reducers:
> set mapreduce.job.reduces=<number>
> java.io.IOException: org.apache.hadoop.hive.serde2.avro.AvroSerdeException:
> Neither avro.schema.literal nor avro.schema.url specified, can't determine
> table schema
> at
> org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat.getHiveRecordWriter(AvroContainerOutputFormat.java:65)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.createEmptyFile(Utilities.java:3430)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.createDummyFileForEmptyPartition(Utilities.java:3463)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.getInputPaths(Utilities.java:3387)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecDriver.execute(ExecDriver.java:370)
> at
> org.apache.hadoop.hive.ql.exec.mr.MapRedTask.execute(MapRedTask.java:137)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:160)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:88)
> at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1640)
> at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1399)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1183)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1049)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1039)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:207)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:159)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:370)
> at
> org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:756)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:675)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:615)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> Caused by: org.apache.hadoop.hive.serde2.avro.AvroSerdeException: Neither
> avro.schema.literal nor avro.schema.url specified, can't determine table
> schema
> at
> org.apache.hadoop.hive.serde2.avro.AvroSerdeUtils.determineSchemaOrThrowException(AvroSerdeUtils.java:109)
> at
> org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat.getHiveRecordWriter(AvroContainerOutputFormat.java:63)
> ... 24 more
> Job Submission failed with exception
> 'java.io.IOException(org.apache.hadoop.hive.serde2.avro.AvroSerdeException:
> Neither avro.schema.literal nor avro.schema.url specified, can't determine
> table schema)'
> FAILED: Execution Error, return code 1 from
> org.apache.hadoop.hive.ql.exec.mr.MapRedTask
> {code}
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