mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-16 11:22:12 +00:00
66 lines
2.3 KiB
Markdown
66 lines
2.3 KiB
Markdown
---
|
|
slug: /en/sql-reference/table-functions/iceberg
|
|
sidebar_position: 90
|
|
sidebar_label: iceberg
|
|
---
|
|
|
|
# iceberg Table Function
|
|
|
|
Provides a read-only table-like interface to Apache [Iceberg](https://iceberg.apache.org/) tables in Amazon S3.
|
|
|
|
## Syntax
|
|
|
|
``` sql
|
|
iceberg(url [,aws_access_key_id, aws_secret_access_key] [,format] [,structure])
|
|
```
|
|
|
|
## Arguments
|
|
|
|
- `url` — Bucket url with the path to an existing Iceberg table in S3.
|
|
- `aws_access_key_id`, `aws_secret_access_key` - Long-term credentials for the [AWS](https://aws.amazon.com/) account user. You can use these to authenticate your requests. These parameters are optional. If credentials are not specified, they are used from the ClickHouse configuration. For more information see [Using S3 for Data Storage](/docs/en/engines/table-engines/mergetree-family/mergetree.md/#table_engine-mergetree-s3).
|
|
- `format` — The [format](/docs/en/interfaces/formats.md/#formats) of the file. By default `Parquet` is used.
|
|
- `structure` — Structure of the table. Format `'column1_name column1_type, column2_name column2_type, ...'`.
|
|
|
|
Engine parameters can be specified using [Named Collections](/docs/en/operations/named-collections.md).
|
|
|
|
**Returned value**
|
|
|
|
A table with the specified structure for reading data in the specified Iceberg table in S3.
|
|
|
|
**Example**
|
|
|
|
```sql
|
|
SELECT * FROM iceberg('http://test.s3.amazonaws.com/clickhouse-bucket/test_table', 'test', 'test')
|
|
```
|
|
|
|
:::important
|
|
ClickHouse currently supports reading v1 (v2 support is coming soon!) of the Iceberg format via the `iceberg` table function and `Iceberg` table engine.
|
|
:::
|
|
|
|
## Defining a named collection
|
|
|
|
Here is an example of configuring a named collection for storing the URL and credentials:
|
|
|
|
```xml
|
|
<clickhouse>
|
|
<named_collections>
|
|
<iceberg_conf>
|
|
<url>http://test.s3.amazonaws.com/clickhouse-bucket/</url>
|
|
<access_key_id>test<access_key_id>
|
|
<secret_access_key>test</secret_access_key>
|
|
<format>auto</format>
|
|
<structure>auto</structure>
|
|
</iceberg_conf>
|
|
</named_collections>
|
|
</clickhouse>
|
|
```
|
|
|
|
```sql
|
|
SELECT * FROM iceberg(iceberg_conf, filename = 'test_table')
|
|
DESCRIBE iceberg(iceberg_conf, filename = 'test_table')
|
|
```
|
|
|
|
**See Also**
|
|
|
|
- [Iceberg engine](/docs/en/engines/table-engines/integrations/iceberg.md)
|