[jira] [Updated] (SPARK-25722) Support a backtick character in column names

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun updated SPARK-25722:
----------------------------------
    Priority: Minor  (was: Major)

> Support a backtick character in column names
> --------------------------------------------
>
>                 Key: SPARK-25722
>                 URL: https://issues.apache.org/jira/browse/SPARK-25722
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Dongjoon Hyun
>            Priority: Minor
>
> Among built-in data sources, `avro` and `orc` doesn't allow `backtick` in column names. We had better be consistent if possible.
>  
> *TEXT*, *CSV*, *JSON*, *PARQUET*
> {code:java}
> Seq("text", "csv", "json", "parquet").foreach { format =>
>   Seq("1").toDF("`").write.mode("overwrite").format(format).save("/tmp/t")
> }{code}
> *AVRO*
> {code:java}
> scala> Seq("1").toDF("`").write.mode("overwrite").format("avro").save("/tmp/t")
> org.apache.avro.SchemaParseException: Illegal initial character: `{code}
> *ORC*
> {code:java}
> scala> Seq("1").toDF("`").write.mode("overwrite").format("orc").save("/tmp/t")
> java.lang.IllegalArgumentException: Unmatched quote at 'struct<^```:string>'{code}



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