zhengruifeng commented on PR #49879:
URL: https://github.com/apache/spark/pull/49879#issuecomment-2650500306
There is a confusion in the usage of `string` in many functions, some string
inputs are treated as literal strings, some are treated as column names.
With a column input, it is easy to clearly resolve such confusion,
sf.col("a") vs sf.lit("a")
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