NestedLoopJoinExecutor

risingwave_batch_executors::executor::nested_loop_join

Struct NestedLoopJoinExecutor 

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pub struct NestedLoopJoinExecutor {
    join_expr: BoxedExpression,
    join_type: JoinType,
    original_schema: Schema,
    schema: Schema,
    output_indices: Vec<usize>,
    left_child: BoxedExecutor,
    right_child: BoxedExecutor,
    identity: String,
    chunk_size: usize,
    mem_context: MemoryContext,
    shutdown_rx: ShutdownToken,
}
Expand description

Nested loop join executor.

High Level Idea:

  1. Iterate tuple from left child.
  2. Concatenated with right chunk, eval expression and get visibility bitmap
  3. Create new chunk with visibility bitmap and yield to upper.

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§join_expr: BoxedExpression

Expression to eval join condition

§join_type: JoinType

Executor should handle different join type.

§original_schema: Schema

Original output schema

§schema: Schema

Actual output schema

§output_indices: Vec<usize>

We may only need certain columns. output_indices are the indices of the columns that we needed.

§left_child: BoxedExecutor

Left child executor

§right_child: BoxedExecutor

Right child executor

§identity: String

Identity string of the executor

§chunk_size: usize

The maximum size of the chunk produced by executor at a time.

§mem_context: MemoryContext

Memory context used for recording memory usage of executor.

§shutdown_rx: ShutdownToken

Implementations§

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impl NestedLoopJoinExecutor

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fn do_execute( self: Box<Self>, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send>>

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impl NestedLoopJoinExecutor

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async fn concatenate_and_eval( expr: &dyn Expression, left_row_types: &[DataType], left_row: RowRef<'_>, right_chunk: &DataChunk, ) -> Result<DataChunk>

Create a chunk by concatenating a row with a chunk and set its visibility according to the evaluation result of the expression.

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impl NestedLoopJoinExecutor

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pub fn new( join_expr: BoxedExpression, join_type: JoinType, output_indices: Vec<usize>, left_child: BoxedExecutor, right_child: BoxedExecutor, identity: String, chunk_size: usize, mem_context: MemoryContext, shutdown_rx: ShutdownToken, ) -> Self

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impl NestedLoopJoinExecutor

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fn do_inner_join<'_async0>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

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fn do_left_outer_join<'_async0>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

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fn do_left_semi_anti_join<'_async0, const ANTI_JOIN: bool>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

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fn do_right_outer_join<'_async0>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

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fn do_right_semi_anti_join<'_async0, const ANTI_JOIN: bool>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

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fn do_full_outer_join<'_async0>( chunk_builder: &'_async0 mut DataChunkBuilder, left_data_types: Vec<DataType>, join_expr: BoxedExpression, left: Vec<DataChunk>, right: BoxedExecutor, shutdown_rx: ShutdownToken, ) -> Pin<Box<dyn Stream<Item = Result<DataChunk, BatchError>> + Send + '_async0>>

Trait Implementations§

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impl BoxedExecutorBuilder for NestedLoopJoinExecutor

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async fn new_boxed_executor( source: &ExecutorBuilder<'_>, inputs: Vec<BoxedExecutor>, ) -> Result<BoxedExecutor>

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impl Executor for NestedLoopJoinExecutor

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fn schema(&self) -> &Schema

Returns the schema of the executor’s return data. Read more
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fn identity(&self) -> &str

Identity string of the executor
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fn execute(self: Box<Self>) -> BoxedDataChunkStream

Executes to return the data chunk stream. Read more

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