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
.
Fields§
§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
Auto 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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