presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/InlineProjections.java/InlineProjections/extractTryArguments
class InlineProjections:    private static Set<Symbol> extractTryArguments(Expression expression)
    {
        return AstUtils.preOrder(expression)
                .filter(TryExpression.class::isInstance)
                .map(TryExpression.class::cast)
                .flatMap(tryExpression -> SymbolsExtractor.extractAll(tryExpression).stream())
                .collect(toSet());
    }