Type Alias deltalake::datafusion::logical_expr::StateTypeFunction
source · pub type StateTypeFunction = Arc<dyn Fn(&DataType) -> Result<Arc<Vec<DataType>>, DataFusionError> + Sync + Send>;
Expand description
Factory that returns the types used by an aggregator to serialize its state, given its return datatype.
Aliased Type§
struct StateTypeFunction { /* private fields */ }