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: _topic_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>Represents a column in a dataset.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct TopicColumn {
    /// <p>The name of the column.</p>
    pub column_name: ::std::string::String,
    /// <p>A user-friendly name for the column.</p>
    pub column_friendly_name: ::std::option::Option<::std::string::String>,
    /// <p>A description of the column and its contents.</p>
    pub column_description: ::std::option::Option<::std::string::String>,
    /// <p>The other names or aliases for the column.</p>
    pub column_synonyms: ::std::option::Option<::std::vec::Vec<::std::string::String>>,
    /// <p>The role of the column in the data. Valid values are <code>DIMENSION</code> and <code>MEASURE</code>.</p>
    pub column_data_role: ::std::option::Option<crate::types::ColumnDataRole>,
    /// <p>The type of aggregation that is performed on the column data when it's queried.</p>
    pub aggregation: ::std::option::Option<crate::types::DefaultAggregation>,
    /// <p>A Boolean value that indicates whether the column is included in 
    
    pub fn build(self) -> ::std::result::Result<crate::types::TopicColumn, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::TopicColumn {
            column_name: self.column_name.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "column_name",
                    "column_name was not specified but it is required when building TopicColumn",
                )
            })?,
            column_friendly_name: self.column_friendly_name,
            column_description: self.column_description,
            column_synonyms: self.column_synonyms,
            column_data_role: self.column_data_role,
            aggregation: self.aggregation,
            is_included_in_topic: self.is_included_in_topic.unwrap_or_default(),
            disable_indexing: self.disable_indexing,
            comparative_order: self.comparative_order,
            semantic_type: self.semantic_type,
            time_granularity: self.time_granularity,
            allowed_aggregations: self.allowed_aggregations,
            not_allowed_aggregations: self.not_allowed_aggregations,
            default_formatting: self.default_formatting,
            never_aggregate_in_filter: self.never_aggregate_in_filter.unwrap_or_default(),
            cell_value_synonyms: self.cell_value_synonyms,
            non_additive: self.non_additive,
        })
    }