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: _copy_command.rs
    path of file: ./repos/aws-sdk-rust/sdk/firehose/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>Describes a <code>COPY</code> command for Amazon Redshift.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct CopyCommand {
    /// <p>The name of the target table. The table must already exis
    
    pub fn build(self) -> ::std::result::Result<crate::types::CopyCommand, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::CopyCommand {
            data_table_name: self.data_table_name.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "data_table_name",
                    "data_table_name was not specified but it is required when building CopyCommand",
                )
            })?,
            data_table_columns: self.data_table_columns,
            copy_options: self.copy_options,
        })
    }