Github user janewangfb commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18023#discussion_r125147853
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -847,6 +847,11 @@ object SQLConf {
           .intConf
           
.createWithDefault(UnsafeExternalSorter.DEFAULT_NUM_ELEMENTS_FOR_SPILL_THRESHOLD.toInt)
     
    +  val SUPPORT_QUOTED_REGEX_COLUMN_NAME = 
buildConf("spark.sql.parser.quotedRegexColumnNames")
    +    .doc("When true, a SELECT statement can take regex-based column 
specification.")
    --- End diff --
    
    updated


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