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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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Affects Version/s: (was: 2.4.0)
3.0.0
> 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: 3.0.0
> 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.
> * Option 1: Support a backtick character
> * Option 2: Disallow a backtick character (This may be considered as a
> regression at TEXT/CSV/JSON/Parquet)
> So, Option 1 is better.
> *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 (native)*
> {code:java}
> scala> Seq("1").toDF("`").write.mode("overwrite").format("orc").save("/tmp/t")
> java.lang.IllegalArgumentException: Unmatched quote at
> 'struct<^```:string>'{code}
> *ORC (hive)*
> {code:java}
> scala> Seq("1").toDF("`").write.mode("overwrite").format("orc").save("/tmp/t")
> java.lang.IllegalArgumentException: Error: name expected at the position 7 of
> 'struct<`:string>' but '`' is found.{code}
>
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