HyukjinKwon commented on a change in pull request #26200: 
[SPARK-29542][SQL][DOC] Make the descriptions of spark.sql.files.* be clearly
URL: https://github.com/apache/spark/pull/26200#discussion_r337817503
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -980,33 +980,36 @@ object SQLConf {
       .createWithDefault(true)
 
   val FILES_MAX_PARTITION_BYTES = 
buildConf("spark.sql.files.maxPartitionBytes")
-    .doc("The maximum number of bytes to pack into a single partition when 
reading files.")
+    .doc("The maximum number of bytes to pack into a single partition when 
Spark file-based " +
+      "sources are used to read files.")
 
 Review comment:
   Can you just revert everything here and add a sentence like "This 
configuration is effective only when using file-based sources such as Parquet, 
JSON and ORC." at the end of each configuration?

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