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

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

Dongjoon Hyun created SPARK-25722:
-------------------------------------

             Summary: Support a backtick character in column names
                 Key: SPARK-25722
                 URL: https://issues.apache.org/jira/browse/SPARK-25722
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Dongjoon Hyun


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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