risingwave_stream::executor::lookup::impl_

Struct LookupExecutorParams

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pub struct LookupExecutorParams<S: StateStore> {
Show 13 fields pub ctx: ActorContextRef, pub info: ExecutorInfo, pub arrangement: Executor, pub stream: Executor, pub arrangement_col_descs: Vec<ColumnDesc>, pub arrangement_order_rules: Vec<ColumnOrder>, pub column_mapping: Vec<usize>, pub use_current_epoch: bool, pub stream_join_key_indices: Vec<usize>, pub arrange_join_key_indices: Vec<usize>, pub storage_table: StorageTable<S>, pub watermark_epoch: AtomicU64Ref, pub chunk_size: usize,
}
Expand description

Parameters for LookupExecutor.

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§ctx: ActorContextRef§info: ExecutorInfo§arrangement: Executor

The side for arrangement. Currently, it should be a MaterializeExecutor.

§stream: Executor

The side for stream. It can be any stream, but it will generally be a MaterializeExecutor.

§arrangement_col_descs: Vec<ColumnDesc>

Should be the same as ColumnDesc in the arrangement.

From the perspective of arrangements, arrangement_col_descs include all columns of the MaterializeExecutor. For example, if we already have a table with 3 columns: a, b, _row_id, and we create an arrangement with join key a on it. arrangement_col_descs should contain all 3 columns.

§arrangement_order_rules: Vec<ColumnOrder>

Should only contain ColumnOrder for arrange in the arrangement.

Still using the above a, b, _row_id example. If we create an arrangement with join key a, there will be 3 elements in arrangement_col_descs, and only 1 element in arrangement_order_rules.

  • The only element is the order rule for a, which is the join key. Join keys should always come first.

For the MV pk, they will only be contained in arrangement_col_descs, without being part of this arrangement_order_rules.

§column_mapping: Vec<usize>

By default, the output of LookupExecutor is stream columns + arrangement columns. The executor will do a reorder of columns before producing output, so that data can be consistent among A lookup B and B lookup A.

§use_current_epoch: bool

Whether to use the current epoch of the arrangement to lookup.

LookupExecutor will act differently on whether use_current_epoch is set to true. In a nutshell, lookup in the previous epoch (this option set to false) will be more efficient. Therefore, the optimizer should choose an optimal order for lookup executors.

See stream_lookup_arrange_this_epoch and stream_lookup_arrange_prev_epoch for more information.

§stream_join_key_indices: Vec<usize>

The join keys on the stream side.

§arrange_join_key_indices: Vec<usize>

The join keys on the arrangement side.

§storage_table: StorageTable<S>§watermark_epoch: AtomicU64Ref§chunk_size: usize

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