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https://issues.apache.org/jira/browse/SPARK-25722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-25722:
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Issue Type: Improvement (was: Bug)
> 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: Major
>
> 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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