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[SPARK-23157][SQL] Explain restriction on column expression in withCo…
…lumn() ## What changes were proposed in this pull request? It's not obvious from the comments that any added column must be a function of the dataset that we are adding it to. Add a comment to that effect to Scala, Python and R Data* methods. Author: Henry Robinson <firstname.lastname@example.org> Closes #20429 from henryr/SPARK-23157. (cherry picked from commit 8b98324) Signed-off-by: gatorsmile <email@example.com>
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