query::optimizer::parallelize_scan

Struct ParallelizeScan

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pub struct ParallelizeScan;

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impl ParallelizeScan

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fn do_optimize( plan: Arc<dyn ExecutionPlan>, config: &ConfigOptions, ) -> Result<Arc<dyn ExecutionPlan>>

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fn assign_partition_range( ranges: Vec<PartitionRange>, expected_partition_num: usize, ) -> Vec<Vec<PartitionRange>>

Distribute PartitionRanges to each partition.

Currently we assign ranges to partitions according to their rows so each partition has similar number of rows. This method may return partitions with smaller number than expected_partition_num if the number of ranges is smaller than expected_partition_num. But this will return at least one partition.

Trait Implementations§

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impl PhysicalOptimizerRule for ParallelizeScan

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fn optimize( &self, plan: Arc<dyn ExecutionPlan>, config: &ConfigOptions, ) -> Result<Arc<dyn ExecutionPlan>>

Rewrite plan to an optimized form
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fn name(&self) -> &str

A human readable name for this optimizer rule
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fn schema_check(&self) -> bool

A flag to indicate whether the physical planner should valid the rule will not change the schema of the plan after the rewriting. Some of the optimization rules might change the nullable properties of the schema and should disable the schema check.

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