Module datafusion::optimizer

This module contains a query optimizer that operates against a logical plan and applies some simple rules to a logical plan, such as “Projection Push Down” and “Type Coercion”.

Modules

common_subexpr_eliminate

Eliminate common sub-expression.

eliminate_limit

Optimizer rule to replace LIMIT 0 on a plan with an empty relation. This saves time in planning and executing the query.

filter_push_down

Filter Push Down optimizer rule ensures that filters are applied as early as possible in the plan

limit_push_down

Optimizer rule to push down LIMIT in the query plan It will push down through projection, limits (taking the smaller limit)

optimizer

Query optimizer traits

projection_push_down

Projection Push Down optimizer rule ensures that only referenced columns are loaded into memory

simplify_expressions

Simplify expressions optimizer rule

single_distinct_to_groupby

single distinct to group by optimizer rule

to_approx_perc

espression/function to approx_percentile optimizer rule

utils

Collection of utility functions that are leveraged by the query optimizer rules