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Clickhouse data sources are Clickhouse tables or views.
These can be specified either by a table reference or a SQL query.
## Disclaimer
The Clickhouse data source does not achieve full test coverage.
Please do not assume complete stability.
## Examples
Defining a Clickhouse source:
```python
from feast.infra.offline_stores.contrib.clickhouse_offline_store.clickhouse_source import (
ClickhouseSource,
)
driver_stats_source = ClickhouseSource(
name="feast_driver_hourly_stats",
query="SELECT * FROM feast_driver_hourly_stats",
timestamp_field="event_timestamp",
created_timestamp_column="created",
)
```
The full set of configuration options is available [here](https://rtd.feast.dev/en/master/#feast.infra.offline_stores.contrib.clickhouse_offline_store.clickhouse_source.ClickhouseSource).
## Supported Types
Clickhouse data sources support all eight primitive types and their corresponding array types.
The support for Clickhouse Decimal type is achieved by converting it to double.
For a comparison against other batch data sources, please see [here](overview.md#functionality-matrix).
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The Clickhouse offline store provides support for reading [ClickhouseSource](../data-sources/clickhouse.md).
* Entity dataframes can be provided as a SQL query or can be provided as a Pandas dataframe. A Pandas dataframes will be uploaded to Clickhouse as a table (temporary table by default) in order to complete join operations.
## Disclaimer
The Clickhouse offline store does not achieve full test coverage.
Please do not assume complete stability.
## Getting started
In order to use this offline store, you'll need to run `pip install 'feast[clickhouse]'`.
Note that `use_temporary_tables_for_entity_df` is an optional parameter.
The full set of configuration options is available in [ClickhouseOfflineStoreConfig](https://rtd.feast.dev/en/master/#feast.infra.offline_stores.contrib.clickhouse_offline_store.clickhouse.ClickhouseOfflineStore).
## Functionality Matrix
The set of functionality supported by offline stores is described in detail [here](overview.md#functionality).
Below is a matrix indicating which functionality is supported by the Clickhouse offline store.
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feat: Clickhouse offline store #4725
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feat: Clickhouse offline store #4725
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