presto-parser/src/main/java/io/prestosql/sql/tree/CoalesceExpression.java/CoalesceExpression/CoalesceExpression
class CoalesceExpression:    private CoalesceExpression(Optional<NodeLocation> location, List<Expression> operands)
    {
        super(location);
        requireNonNull(operands, "operands is null");
        checkArgument(operands.size() >= 2, "must have at least two operands");

        this.operands = ImmutableList.copyOf(operands);
    }