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66 lines
2.3 KiB
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66 lines
2.3 KiB
Markdown
---
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slug: /en/sql-reference/table-functions/iceberg
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sidebar_position: 90
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sidebar_label: iceberg
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---
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# iceberg Table Function
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Provides a read-only table-like interface to Apache [Iceberg](https://iceberg.apache.org/) tables in Amazon S3.
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## Syntax
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``` sql
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iceberg(url [,aws_access_key_id, aws_secret_access_key] [,format] [,structure])
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```
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## Arguments
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- `url` — Bucket url with the path to an existing Iceberg table in S3.
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- `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).
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- `format` — The [format](/docs/en/interfaces/formats.md/#formats) of the file. By default `Parquet` is used.
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- `structure` — Structure of the table. Format `'column1_name column1_type, column2_name column2_type, ...'`.
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Engine parameters can be specified using [Named Collections](/docs/en/operations/named-collections.md).
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**Returned value**
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A table with the specified structure for reading data in the specified Iceberg table in S3.
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**Example**
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```sql
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SELECT * FROM iceberg('http://test.s3.amazonaws.com/clickhouse-bucket/test_table', 'test', 'test')
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```
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:::important
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ClickHouse currently supports reading v1 (v2 support is coming soon!) of the Iceberg format via the `iceberg` table function and `Iceberg` table engine.
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:::
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## Defining a named collection
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Here is an example of configuring a named collection for storing the URL and credentials:
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```xml
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<clickhouse>
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<named_collections>
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<iceberg_conf>
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<url>http://test.s3.amazonaws.com/clickhouse-bucket/</url>
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<access_key_id>test<access_key_id>
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<secret_access_key>test</secret_access_key>
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<format>auto</format>
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<structure>auto</structure>
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</iceberg_conf>
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</named_collections>
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</clickhouse>
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```
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```sql
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SELECT * FROM iceberg(iceberg_conf, filename = 'test_table')
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DESCRIBE iceberg(iceberg_conf, filename = 'test_table')
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```
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**See Also**
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- [Iceberg engine](/docs/en/engines/table-engines/integrations/iceberg.md)
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