pub fn parse_column_default_constraint(
column_name: &str,
data_type: &ConcreteDataType,
opts: &[ColumnOptionDef],
timezone: Option<&Timezone>,
) -> Result<Option<ColumnDefaultConstraint>>pub fn parse_column_default_constraint(
column_name: &str,
data_type: &ConcreteDataType,
opts: &[ColumnOptionDef],
timezone: Option<&Timezone>,
) -> Result<Option<ColumnDefaultConstraint>>