Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18023
Let me post a confusing error message.
```Scala
withSQLConf(SQLConf.SUPPORT_QUOTED_REGEX_COLUMN_NAME.key -> "true") {
Seq((1, 1)).toDF("key", "value").createOrReplaceTempView("test")
sql("select `key` from test where `key` > 3").show()
}
```
The error message is:
```
Invalid call to dataType on unresolved object, tree: key
org.apache.spark.sql.catalyst.analysis.UnresolvedException: Invalid call to
dataType on unresolved object, tree: key
at
org.apache.spark.sql.catalyst.analysis.Star.dataType(unresolved.scala:250)
at
org.apache.spark.sql.catalyst.expressions.BinaryOperator.checkInputDataTypes(Expression.scala:517)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:92)
```
Users might use quoted attributes in any place of a query.
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