presto-main/src/main/java/io/prestosql/connector/informationschema/InformationSchemaColumnHandle.java/InformationSchemaColumnHandle/equals
class InformationSchemaColumnHandle:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        InformationSchemaColumnHandle other = (InformationSchemaColumnHandle) obj;
        return Objects.equals(columnName, other.columnName);
    }