Method normalize

pkg/sql/sem/tree/normalize.go:81–115

(v *NormalizeVisitor)

}

func (expr *UnaryExpr) normalize(v *NormalizeVisitor) TypedExpr {
	val := expr.TypedInnerExpr()

	if val == DNull {
		return val
	}

	switch expr.Operator {
	case UnaryMinus:
		// -0 -> 0 (except for float which has negative zero)
		if val.ResolvedType().Family() != types.FloatFamily && v.isNumericZero(val) {
			return val
		}
		switch b := val.(type) {
		// -(a - b) -> (b - a)
		case *BinaryExpr:
			if b.Operator == Minus {
				newBinExpr := newBinExprIfValidOverload(Minus,
					b.TypedRight(), b.TypedLeft())
				if newBinExpr != nil {
					newBinExpr.memoizeFn()
					b = newBinExpr
				}
				return b
			}
		// - (- a) -> a
		case *UnaryExpr:
			if b.Operator == UnaryMinus {
				return b.TypedInnerExpr()
			}
		}
	}

	return expr
}

func (expr *BinaryExpr) normalize(v *NormalizeVisitor) TypedExpr {
	left := expr.TypedLeft()