Given an Update(or Insert) object how can I find the columns being
updated (or Inserted).
I dont find any function that gives these?


t = Table("abc", MetaData(conn), Column("x", String), Column("y",
Integer))
u = t.update().values(x='a')

# Now I want to get list of columns being updated (i.e., x)  given u
(i.e., Update object)

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