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

    https://github.com/apache/spark/pull/22358#discussion_r216165218
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -398,10 +398,10 @@ object SQLConf {
           "`parquet.compression` is specified in the table-specific 
options/properties, the " +
           "precedence would be `compression`, `parquet.compression`, " +
           "`spark.sql.parquet.compression.codec`. Acceptable values include: 
none, uncompressed, " +
    -      "snappy, gzip, lzo, brotli, lz4, zstd.")
    +      "snappy, gzip, lzo, lz4.")
         .stringConf
         .transform(_.toLowerCase(Locale.ROOT))
    -    .checkValues(Set("none", "uncompressed", "snappy", "gzip", "lzo", 
"lz4", "brotli", "zstd"))
    --- End diff --
    
    I thought if you remove it from here the user would not be able to use zstd 
or brotli even if it is installed/enabled/available?


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