presto-main/src/main/java/io/prestosql/sql/planner/PlanBuilder.java/PlanBuilder/copyTranslations
class PlanBuilder:    public TranslationMap copyTranslations()
    {
        TranslationMap translations = new TranslationMap(getRelationPlan(), getAnalysis(), getTranslations().getLambdaDeclarationToSymbolMap());
        translations.copyMappingsFrom(getTranslations());
        return translations;
    }