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https://issues.apache.org/jira/browse/DRILL-1760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219868#comment-14219868
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Steven Phillips commented on DRILL-1760:
----------------------------------------
This seems pretty simple. We just need to implement a count function for maps.
> Count on a map fails with SchemaChangeException
> -----------------------------------------------
>
> Key: DRILL-1760
> URL: https://issues.apache.org/jira/browse/DRILL-1760
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Hanifi Gunes
>
> Take yelp business dataset and run
> {code:sql}
> select count(attributes) from dfs.`/path/to/yelp-business.json`
> {code}
> you should read
> {code:java}
> org.apache.drill.exec.exception.SchemaChangeException: Failure while
> materializing expression.
> Error in expression at index -1. Error: Missing function implementation:
> [count(MAP-REQUIRED)]. Full expression: --UNKNOWN EXPRESSION--.
> at
> org.apache.drill.exec.physical.impl.aggregate.StreamingAggBatch.createAggregatorInternal(StreamingAggBatch.java:221)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.aggregate.StreamingAggBatch.createAggregator(StreamingAggBatch.java:173)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.aggregate.StreamingAggBatch.buildSchema(StreamingAggBatch.java:89)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.buildSchema(IteratorValidatorBatchIterator.java:80)
> [classes/:na]
> at
> org.apache.drill.exec.record.AbstractSingleRecordBatch.buildSchema(AbstractSingleRecordBatch.java:109)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.buildSchema(IteratorValidatorBatchIterator.java:80)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.svremover.RemovingRecordBatch.buildSchema(RemovingRecordBatch.java:64)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.buildSchema(IteratorValidatorBatchIterator.java:80)
> [classes/:na]
> at
> org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.buildSchema(ScreenCreator.java:95)
> [classes/:na]
> at
> org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:111)
> [classes/:na]
> at
> org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:249)
> [classes/:na]
> 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]
> {code}
> I would expect to be able run count query on `attributes` field given that I
> can run a select on the same field.
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