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ExecutionPlan

nervusdb_core::query::executor

Trait ExecutionPlan 

Source 
pub trait ExecutionPlan {
    // Required methods
    fn execute<'a>(
        &'a self,
        ctx: &'a ExecutionContext<'a>,
    ) -> Result<Box<dyn Iterator<Item = Result<Record, Error>> + 'a>, Error>;
    fn estimate_cardinality(&self, ctx: &ExecutionContext<'_>) -> usize;
}

Required Methods§

Source

fn execute<'a>( &'a self, ctx: &'a ExecutionContext<'a>, ) -> Result<Box<dyn Iterator<Item = Result<Record, Error>> + 'a>, Error>

Source

fn estimate_cardinality(&self, ctx: &ExecutionContext<'_>) -> usize

估算该操作的输出基数

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§