[jira] [Resolved] (SPARK-6607) Aggregation attribute name including special chars '(' and ')' should be replaced before generating Parquet schema

["Cheng Lian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-6607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cheng Lian resolved SPARK-6607.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

Issue resolved by pull request 5263
[https://github.com/apache/spark/pull/5263]

> Aggregation attribute name including special chars '(' and ')' should be replaced before generating Parquet schema
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-6607
>                 URL: https://issues.apache.org/jira/browse/SPARK-6607
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.1.1, 1.2.1, 1.3.0
>            Reporter: Liang-Chi Hsieh
>            Assignee: Liang-Chi Hsieh
>             Fix For: 1.4.0
>
>
> '(' and ')' are special characters used in Parquet schema for type annotation. When we run an aggregation query, we will obtain attribute name such as "MAX(a)".
> If we directly store the generated DataFrame as Parquet file, it causes failure when reading and parsing the stored schema string.
> Several methods can be adopted to solve this. This pr uses a simplest one to just replace attribute names before generating Parquet schema based on these attributes.
> Another possible method might be modifying all aggregation expression names from "func(column)" to "func[column]".



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