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From "Cheng Lian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-1913) column pruning problem of Parquet File
Date Fri, 23 May 2014 10:34:01 GMT

    [ https://issues.apache.org/jira/browse/SPARK-1913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007026#comment-14007026
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Cheng Lian commented on SPARK-1913:
-----------------------------------

Attributes referenced only in those filters that are pushed down are not considered when building
the {{ParquetTableScan}} operator in {{ParquetOperations}}. Will submit a PR for this.

> column pruning problem of Parquet  File
> ---------------------------------------
>
>                 Key: SPARK-1913
>                 URL: https://issues.apache.org/jira/browse/SPARK-1913
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.0.0
>         Environment: mac os 10.9.2
>            Reporter: Chen Chao
>
> case class Person(name: String, age: Int)
> if we use Parquet file, the following statement will throw a exception says  java.lang.IllegalArgumentException:
Column age does not exist.
> sql("SELECT name  FROM parquetFile WHERE age >= 13 AND age <= 19") 
> we have to add age column after SELECT in order to make it right:
> sql("SELECT name , age  FROM parquetFile WHERE age >= 13 AND age <= 19") 
> The same error also occurs when we use DSL:
>  parquetFile.where('key === 1).select('value as 'a).collect().foreach(println)
> will tell us can not find column 'key',we have to fix like this : 
>  parquetFile.where('key === 1).select('key ,'value as 'a).collect().foreach(println)
> Obviously, that's not the way we want!



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