jayzhan211 commented on issue #14987:
URL: https://github.com/apache/datafusion/issues/14987#issuecomment-2696048551
```rust
mpl Optimizer {
/// Create a new optimizer using the recommended list of rules
pub fn new() -> Self {
let rules: Vec<Arc<dyn OptimizerRule + Sync + Send>> = vec![
Arc::new(EliminateNestedUnion::new()),
Arc::new(SimplifyExpressions::new()),
Arc::new(UnwrapCastInComparison::new()),
Arc::new(ReplaceDistinctWithAggregate::new()),
Arc::new(EliminateJoin::new()),
Arc::new(DecorrelatePredicateSubquery::new()),
Arc::new(ScalarSubqueryToJoin::new()),
Arc::new(ExtractEquijoinPredicate::new()),
Arc::new(EliminateDuplicatedExpr::new()),
Arc::new(EliminateFilter::new()),
Arc::new(EliminateCrossJoin::new()),
Arc::new(CommonSubexprEliminate::new()),
Arc::new(EliminateLimit::new()),
Arc::new(PropagateEmptyRelation::new()),
// Must be after PropagateEmptyRelation
Arc::new(EliminateOneUnion::new()),
Arc::new(FilterNullJoinKeys::default()),
Arc::new(EliminateOuterJoin::new()),
// Filters can't be pushed down past Limits, we should do
PushDownFilter after PushDownLimit
Arc::new(PushDownLimit::new()),
Arc::new(PushDownFilter::new()),
Arc::new(SingleDistinctToGroupBy::new()),
// The previous optimizations added expressions and projections,
// that might benefit from the following rules
Arc::new(SimplifyExpressions::new()),
Arc::new(UnwrapCastInComparison::new()),
Arc::new(CommonSubexprEliminate::new()),
Arc::new(EliminateGroupByConstant::new()),
Arc::new(OptimizeProjections::new()),
];
Self::with_rules(rules)
}
/// Create a new optimizer with the given rules
pub fn with_rules(rules: Vec<Arc<dyn OptimizerRule + Send + Sync>>) ->
Self {
Self { rules }
}
}
```
```rust
let rules = ...
let optimizer = Optimizer::with_rules(rules);
```
Not sure how they determine the rules they need, but I guess they can add
their rule and datafusion builtin rule for their optimizer?
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