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From "Michael Armbrust (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-8566) lateral view query blows up unless pushed down to a subquery
Date Tue, 23 Jun 2015 18:34:01 GMT

    [ https://issues.apache.org/jira/browse/SPARK-8566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14598136#comment-14598136
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Michael Armbrust commented on SPARK-8566:
-----------------------------------------

What is the schema of your file?  That error sometimes means you have columns with duplicates
names.

> lateral view query blows up unless pushed down to a subquery
> ------------------------------------------------------------
>
>                 Key: SPARK-8566
>                 URL: https://issues.apache.org/jira/browse/SPARK-8566
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.4.0
>            Reporter: Eric Friedman
>              Labels: sparksql
>
> I have a query which works in Hive but not in SparkSQL against the same Hive metastore
unless I introduce a subquery:
> select col from table 
> lateral view explode(map_keys(col_map)) t1 as col
> parquet.io.ParquetDecodingException: Can not read value at 0 in block -1 in file hdfs://nameservice1/path/to/parquet.gz
> at parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:213)
> 	at parquet.hadoop.ParquetRecordReader.nextKeyValue(ParquetRecordReader.java:204)
> 	at org.apache.spark.sql.sources.SqlNewHadoopRDD$$anon$1.hasNext(SqlNewHadoopRDD.scala:163)
> 	at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
> but if I rewrite it like so, it works:
> select col from (select map_keys(col_map) keys from table) t2 lateral view explode(t2.keys)
t1 as col



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