sealed trait Column[A] extends AnyRef
A column, column literal, or column expression.
This is a more general concept than it may first seem. For example, in the SQL:
SELECT a, b, c FROM t WHERE a == 1
all of the following would be represented as instances of Column:
a, b, c, 1, and a == 1.
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- abstract val columnType: ColumnType[A]
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