TableExpr

Find the innermost owner of the supplied column within this TableExpr

Is this TableExpr backed by an SQL union

This is used to determine whether or not non-nullable columns should be weakened to being nullable when fetched

The name of this TableExpr

Yields a copy of this TableExpr with all occurences of from replaced by to

Render a defining occurence of this TableExpr

Render a reference to this TableExpr

Is the supplied column an immediate component of this TableExpr?

The name, if any, of this ColumnOwner