Module mz_transform::dataflow

Expand description

Whole-dataflow optimization

A dataflow may contain multiple views, each of which may only be optimized locally. However, information like demand and predicate pushdown can be applied across views once we understand the context in which the views will be executed.

Statics

CALLSITE 🔒

META 🔒

Functions

inline_views 🔒

Inline views used in one other view, and in no exported objects.

optimize_dataflow

Optimizes the implementation of each dataflow.

optimize_dataflow_demand 🔒

Pushes demand information from published outputs to dataflow inputs, projecting away unnecessary columns.

optimize_dataflow_demand_inner

Pushes demand through views in view_sequence in order, removing columns not demanded.

optimize_dataflow_filters 🔒

Pushes predicate to dataflow inputs.

optimize_dataflow_filters_inner

Pushes filters down through views in view_sequence in order.

optimize_dataflow_index_imports 🔒

Restricts the indexes imported by dataflow to only the ones it needs.

optimize_dataflow_monotonic

Propagates information about monotonic inputs through operators.

optimize_dataflow_relations 🔒

Performs either the logical or the physical optimization pass on the dataflow using the supplied set of indexes.