SqlColumn

Derives a new column with a different owner with this column as underlying.

Used to represent columns on the outside of subqueries and common table expressions. Note that column aliases are tracked across derivation so that derived columns will continue to refer to the same underlying data irrespective of renaming.

Equality on SqlColumns

Two SqlColumns are equal if their underlyings have the same name and owner.

Calculate a hash code value for the object.

The default hashing algorithm is platform dependent.

Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

Yields a copy of this column in other

Only well defined if the move doesn't lose an owner name

Returns a string representation of the object.

The default representation is platform dependent.