computed_column_expression clarifications #4579
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Trying to clarify a point that expression must return a value. An example of expression that appears to be valid in the context but does not return a value: https://stackoverflow.com/q/61089445/12339804 Giving an example of how bitwise operators can be used here too.
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An example of expression that appears to be valid but fails the syntax check: https://stackoverflow.com/q/61089445/12339804