[GitHub] [spark] viirya commented on a change in pull request #24894: [SPARK-28058][DOC] Add a note to DROPMALFORMED mode of CSV for column pruning

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viirya commented on a change in pull request #24894: [SPARK-28058][DOC] Add a note to DROPMALFORMED mode of CSV for column pruning
URL: https://github.com/apache/spark/pull/24894#discussion_r294337292
 
 

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 File path: python/pyspark/sql/readwriter.py
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 @@ -441,7 +441,12 @@ def csv(self, path, schema=None, sep=None, encoding=None, quote=None, escape=Non
                   When it meets a record having fewer tokens than the length of the schema, \
                   sets ``null`` to extra fields. When the record has more tokens than the \
                   length of the schema, it drops extra tokens.
-                * ``DROPMALFORMED`` : ignores the whole corrupted records.
+                * ``DROPMALFORMED`` : ignores the whole corrupted records. Note that when CSV \
+                  parser column pruning (``spark.sql.csv.parser.columnPruning.enabled``) is enabled \
 
 Review comment:
   One concern is that `spark.sql.csv.parser.columnPruning.enabled` is internal config. I'm not sure if there is policy that we shouldn't mention internal config in doc.
   
   cc @HyukjinKwon @dongjoon-hyun 

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