pub fn columns(mut self, input: crate::model::Column) -> Self {
            let mut v = self.columns.unwrap_or_default();
            v.push(input);
            self.columns = Some(v);
            self
        }
/// Appends an item to `columns`.
///
/// To override the contents of this collection use [`set_columns`](Self::set_columns).
///
/// <p>Specifies one or more columns that store your data.</p>
/// <p>Each schema can have up to 100 columns. Each column can have up to 100 nested types.</p>
Appends an item to `columns`.
To override the contents of this collection use [`set_columns`](Self::set_columns).

Specifies one or more columns that store your data.
Each schema can have up to 100 columns. Each column can have up to 100 nested types.
Appends an item to ` columns ` . To override the contents of this collection use [ ` set_columns ` ] ( Self :: set_columns ) . Specifies one or more columns that store your data . Each schema can have up to 100 columns . Each column can have up to 100 nested types .
pub fn columns(mut self, input: crate::model::Column) -> Self {
            let mut v = self.columns.unwrap_or_default();
            v.push(input);
            self.columns = Some(v);
            self
        }
pub fn columns ( mut self , input : crate :: model :: Column ) -> Self { let mut v = self . columns . unwrap_or_default ( ) ; v . push ( input ) ; self . columns = Some ( v ) ; self }
Appends an item to `columns`.
Appends an item to ` columns ` .
mut self
input
crate::model::Column
mut self
input
crate::model::Column