presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitDeallocate
class AstBuilder:    @Override
    public Node visitDeallocate(SqlBaseParser.DeallocateContext context)
    {
        return new Deallocate(
                getLocation(context),
                (Identifier) visit(context.identifier()));
    }