presto-main/src/main/java/io/prestosql/sql/SqlPathElement.java/SqlPathElement/equals
class SqlPathElement:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        SqlPathElement that = (SqlPathElement) obj;
        return Objects.equals(catalog, that.catalog) &&
                Objects.equals(schema, that.schema);
    }