presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitUse
class AstBuilder:    @Override
    public Node visitUse(SqlBaseParser.UseContext context)
    {
        return new Use(
                getLocation(context),
                visitIfPresent(context.catalog, Identifier.class),
                (Identifier) visit(context.schema));
    }