we have the following default implementation

```
ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression)

{ return expression; }

;
}
```

in at least the following implementations:

• WhereMatchExpressionBase
• GeoMatchExpression
• GeoNearMatchExpression
• TwoDPtInAnnulusExpression
• SizeMatchExpression
• TextMatchExpressionBase
• TypeMatchExpressionBase
• InternalSchemaBinDataSubTypeExpression
• AlwaysBooleanMatchExpression
• InternalBucketGeoWithinMatchExpression
• ComparisonMatchExpressionBase
• RegexMatchExpression
• ModMatchExpression
• ExistsMatchExpression
• BitTestMatchExpression
• at least half of the JSON schema operators

we should make this the default implementation