Trait AggrFuncTypeStore

pub trait AggrFuncTypeStore:
    Send
    + Sync
    + Debug {
    // Required methods
    fn input_types(&self) -> Result<Vec<ConcreteDataType>>;
    fn set_input_types(&self, input_types: Vec<ConcreteDataType>) -> Result<()>;
}

AggrFuncTypeStore stores the aggregate function’s input data’s types.

When creating Accumulator generically, we have to know the input data’s types. However, DataFusion does not provide the input data’s types at the time of creating Accumulator. To solve the problem, we store the datatypes upfront here.

Required Methods

fn input_types(&self) -> Result<Vec<ConcreteDataType>>

Get the input data types of the Accumulator.

fn set_input_types(&self, input_types: Vec<ConcreteDataType>) -> Result<()>

Store the input data types that are provided by DataFusion at runtime (when it is evaluating return type function).

Implementors