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#[derive(Debug, Serialize, PartialEq, Clone)]
pub struct ColumnName {
    pub name: String,
    pub table: Option<String>,
    pub alias: Option<String>,
}

impl ColumnName {
    /// create table with name
    pub fn from(arg: &str) -> Self {
        if arg.contains(".") {
            let splinters = arg.split(".").collect::<Vec<&str>>();
            assert!(splinters.len() == 2, "There should only be 2 parts, trying to split `.` {}",arg);
            let table = splinters[0].to_owned();
            let name = splinters[1].to_owned();
            ColumnName {
                name: name,
                table: Some(table),
                alias: None,
            }
        } else {
            ColumnName {
                name: arg.to_owned(),
                table: None,
                alias: None,
            }
        }
    }

    /// return the long name of the table using schema.table_name
    pub fn complete_name(&self) -> String {
        match self.table {
            Some(ref table) => format!("{}.{}", table, self.name),
            None => self.name.to_owned(),
        }
    }
}

pub trait ToColumnNames {
    /// extract the columns from struct
    fn to_column_names() -> Vec<ColumnName>;
}