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

    https://github.com/apache/spark/pull/20495#discussion_r165855003
  
    --- Diff: python/pyspark/sql/functions.py ---
    @@ -1705,10 +1705,12 @@ def unhex(col):
     @ignore_unicode_prefix
     @since(1.5)
     def length(col):
    -    """Calculates the length of a string or binary expression.
    +    """Computes the character length of a given string or number of bytes 
or a binary string.
    +    The length of character strings include the trailing spaces. The 
length of binary strings
    --- End diff --
    
    I ask because I want to understand this better to see if we should update R 
https://github.com/apache/spark/blob/master/R/pkg/R/functions.R#L1029


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