You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: _input_column.rs
    path of file: ./repos/aws-sdk-rust/sdk/quicksight/src/types
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.

/// <p>Metadata for a column that is used as the input of a transform operation.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct InputColumn {
    /// <p>The name of this column in the underlying data source.</p>
    pub name: ::std::string::String,
    /// <p>The data type of the column.</p>
    pub r#type: crate::types::InputColumnDataType,
    /// <p>The sub data type of the column. Sub types are only available for decimal columns that are part of a SPICE dataset.</p>
    pub sub_type: ::std::option::Option<crate::types::ColumnDataSubType>,
}
impl InputColumn {
    /// <p>The name of this
    
    pub fn build(self) -> ::std::result::Result<crate::types::InputColumn, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::InputColumn {
            name: self.name.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "name",
                    "name was not specified but it is required when building InputColumn",
                )
            })?,
            r#type: self.r#type.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "r#type",
                    "r#type was not specified but it is required when building InputColumn",
                )
            })?,
            sub_type: self.sub_type,
        })
    }