HyukjinKwon commented on a change in pull request #23882: [SPARK-26979][PYTHON] 
Add missing string column name support for some SQL functions
URL: https://github.com/apache/spark/pull/23882#discussion_r265816244
 
 

 ##########
 File path: python/pyspark/sql/functions.py
 ##########
 @@ -85,13 +96,16 @@ def _():
     >>> df.select(lit(5).alias('height')).withColumn('spark_user', 
lit(True)).take(1)
     [Row(height=5, spark_user=True)]
     """
-_functions = {
+_name_functions = {
+    # name functions take a column name as their argument
     'lit': _lit_doc,
 
 Review comment:
   Does `lit` takes the string as column names? how do we create string literal?

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