Superset 可以与 QuestDB 8.0.0 或更高版本一起使用吗？

Question

我最近从 QuestDB 7.4.2 升级到 QuestDB 8.1.2。我使用 Apache Superset 4.0.0 进行可视化，在升级之前这工作得很好，但现在

questdb-connect

库抛出了一个无用的错误：

2024-10-28T13:28:21.521208472Z ERROR:flask_appbuilder.api:'NoneType' object is not callable
2024-10-28T13:28:21.521233355Z Traceback (most recent call last):
2024-10-28T13:28:21.521237176Z   File "/usr/local/lib/python3.10/site-packages/flask_appbuilder/api/__init__.py", line 110, in wraps
2024-10-28T13:28:21.521240585Z     return f(self, *args, **kwargs)
2024-10-28T13:28:21.521242959Z   File "/app/superset/views/base_api.py", line 127, in wraps
2024-10-28T13:28:21.521245388Z     raise ex
2024-10-28T13:28:21.521248040Z   File "/app/superset/views/base_api.py", line 121, in wraps
2024-10-28T13:28:21.521250464Z     duration, response = time_function(f, self, *args, **kwargs)
2024-10-28T13:28:21.521253488Z   File "/app/superset/utils/core.py", line 1463, in time_function
2024-10-28T13:28:21.521255789Z     response = func(*args, **kwargs)
2024-10-28T13:28:21.521258381Z   File "/app/superset/utils/log.py", line 255, in wrapper
2024-10-28T13:28:21.521261480Z     value = f(*args, **kwargs)
2024-10-28T13:28:21.521263836Z   File "/app/superset/databases/api.py", line 742, in table_metadata
2024-10-28T13:28:21.521266910Z     table_info = get_table_metadata(database, table_name, schema_name)
2024-10-28T13:28:21.521269293Z   File "/app/superset/databases/utils.py", line 67, in get_table_metadata
2024-10-28T13:28:21.521271766Z     columns = database.get_columns(table_name, schema_name)
2024-10-28T13:28:21.521274575Z   File "/app/superset/models/core.py", line 839, in get_columns
2024-10-28T13:28:21.521277035Z     return self.db_engine_spec.get_columns(
2024-10-28T13:28:21.521279705Z   File "/app/superset/db_engine_specs/base.py", line 1340, in get_columns
2024-10-28T13:28:21.521282333Z     cast(list[SQLAColumnType], inspector.get_columns(table_name, schema))
2024-10-28T13:28:21.521284920Z   File "/usr/local/lib/python3.10/site-packages/questdb_connect/inspector.py", line 79, in get_columns
2024-10-28T13:28:21.521287336Z     return self.format_table_columns(table_name, result_set)
2024-10-28T13:28:21.521289845Z   File "/usr/local/lib/python3.10/site-packages/questdb_connect/inspector.py", line 87, in format_table_columns
2024-10-28T13:28:21.521292427Z     return [
2024-10-28T13:28:21.521294748Z   File "/usr/local/lib/python3.10/site-packages/questdb_connect/inspector.py", line 90, in <listcomp>
2024-10-28T13:28:21.521297122Z     "type": resolve_type_from_name(row[1])(),
2024-10-28T13:28:21.521299536Z TypeError: 'NoneType' object is not callable

我不确定出了什么问题，对 Superset 的支持是否已停止？为什么我的代码不能再工作了？

Answer 1

在 QuestDB 8.0.0 及更高版本中，有 UTF-8 Encoded

VARCHAR

类型可用。建议尽可能使用它而不是

STRING

，因为它通常需要更少的存储空间，并提高查询性能。

但是，

questdb-connect

库还不支持这种类型，仅支持

STRING

。因此，如果您尝试连接到表并从

VARCHAR

列检索数据，连接器可能会损坏。

最有可能的是，您将一些

STRING

列交换为

VARCHAR

，现在遇到了这种不兼容性。

要解决此问题，您可以：

1. 出于兼容性原因，必要时交换为

   STRING

   类型。
2. 确保您发送到数据库的查询将任何

   VARCHAR

   列或值转换为

   STRING

   。

对于选项 1，您可以使用以下 SQL：

ALTER TABLE table_name ALTER COLUMN column_name TYPE STRING;

对于选项 2，只需使用强制转换语法

SELECT v::STRING, cast(v as STRING)

希望

questdb-connect

能够尽快更新，以按预期使用

VARCHAR

类型。