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 batch_table: BatchTable<S>,
pub watermark_epoch: AtomicU64Ref,
pub chunk_size: usize,
}Expand description
Parameters for LookupExecutor.
Fields§
§ctx: ActorContextRef§info: ExecutorInfo§arrangement: ExecutorThe side for arrangement. Currently, it should be a
MaterializeExecutor.
stream: ExecutorThe 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: boolWhether 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.
batch_table: BatchTable<S>§watermark_epoch: AtomicU64Ref§chunk_size: usizeAuto Trait Implementations§
impl<S> Freeze for LookupExecutorParams<S>where
S: Freeze,
impl<S> !RefUnwindSafe for LookupExecutorParams<S>
impl<S> Send for LookupExecutorParams<S>
impl<S> !Sync for LookupExecutorParams<S>
impl<S> Unpin for LookupExecutorParams<S>where
S: Unpin,
impl<S> !UnwindSafe for LookupExecutorParams<S>
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