Function Or

pkg/sql/inverted/expression.go:610–638

Or of two boolean expressions. This function may modify both the left and right Expressions.

(left, right Expression)

// Or of two boolean expressions. This function may modify both the left and
// right Expressions.
func Or(left, right Expression) Expression {
	switch l := left.(type) {
	case *SpanExpression:
		switch r := right.(type) {
		case *SpanExpression:
			return unionSpanExpressions(l, r)
		case NonInvertedColExpression:
			return r
		default:
			return opSpanExpressionAndDefault(l, right, SetUnion)
		}
	case NonInvertedColExpression:
		return left
	default:
		switch r := right.(type) {
		case *SpanExpression:
			return opSpanExpressionAndDefault(r, left, SetUnion)
		case NonInvertedColExpression:
			return right
		default:
			return &SpanExpression{
				Tight:    left.IsTight() && right.IsTight(),
				Operator: SetUnion,
				Left:     left,
				Right:    right,
			}
		}
	}
}

// Helper that applies op to a left-side that is a *SpanExpression and
// a right-side that is an unknown implementation of Expression.