Trait datafusion_sql::planner::ContextProvider

pub trait ContextProvider {
    fn get_table_provider(
        &self,
        name: TableReference<'_>
    ) -> Result<Arc<dyn TableSource>>;
    fn get_function_meta(&self, name: &str) -> Option<Arc<ScalarUDF>>;
    fn get_aggregate_meta(&self, name: &str) -> Option<Arc<AggregateUDF>>;
    fn get_variable_type(&self, variable_names: &[String]) -> Option<DataType>;
}

The ContextProvider trait allows the query planner to obtain meta-data about tables and functions referenced in SQL statements

Required Methods

fn get_table_provider(
    &self,
    name: TableReference<'_>
) -> Result<Arc<dyn TableSource>>

Getter for a datasource

fn get_function_meta(&self, name: &str) -> Option<Arc<ScalarUDF>>

Getter for a UDF description

fn get_aggregate_meta(&self, name: &str) -> Option<Arc<AggregateUDF>>

Getter for a UDAF description

fn get_variable_type(&self, variable_names: &[String]) -> Option<DataType>

Getter for system/user-defined variable type

Implementors