HyukjinKwon commented on issue #23882: [SPARK-26979][PYTHON] Add missing string 
column name support for some SQL functions
URL: https://github.com/apache/spark/pull/23882#issuecomment-473746378
 
 
   There is another exception, `when()` which takes columns and literals:
   
   ```python
   >>> spark.range(1).select(when(lit(True), col("id"))).show()
   ```
   
   ```
   +--------------------------+
   |CASE WHEN true THEN id END|
   +--------------------------+
   |                         0|
   +--------------------------+
   ```
   
   ```python
   >>> spark.range(1).select(when(lit(True), "id")).show()
   ```
   
   ```
   +--------------------------+
   |CASE WHEN true THEN id END|
   +--------------------------+
   |                        id|
   +--------------------------+
   ```
   
   Here's another ambiguity

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