Merge pull request #45127 from DanRoscigno/add-deltalake-docs

Add deltalake docs

docs/en/engines/table-engines/integrations/deltalake.md

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+---
+slug: /en/engines/table-engines/integrations/deltalake
+sidebar_label: DeltaLake
+---
+
+# DeltaLake Table Engine
+
+This engine provides a read-only integration with existing [Delta Lake](https://github.com/delta-io/delta) tables in Amazon S3.
+
+## Create Table
+
+Note that the Delta Lake table must already exist in S3, this command does not take DDL parameters to create a new table.
+
+``` sql
+CREATE TABLE deltalake
+    ENGINE = DeltaLake(url, [aws_access_key_id, aws_secret_access_key,])
+```
+
+**Engine parameters**
+
+-   `url` — Bucket url with path to the existing Delta Lake table.
+-   `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. Parameter is optional. If credentials are not specified, they are used from the configuration file. For more information see [Using S3 for Data Storage](../mergetree-family/mergetree.md#table_engine-mergetree-s3).
+
+**Example**
+
+```sql
+CREATE TABLE deltalake ENGINE=DeltaLake('http://mars-doc-test.s3.amazonaws.com/clickhouse-bucket-3/test_table/', 'ABC123', 'Abc+123')
+```
+
+## See also
+
+-  [deltaLake table function](../../../sql-reference/table-functions/deltalake.md)
+

docs/en/sql-reference/table-functions/deltalake.md

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+---
+slug: /en/sql-reference/table-functions/deltalake
+sidebar_label: DeltaLake
+---
+
+# deltaLake Table Function
+
+Provides a read-only table-like interface to [Delta Lake](https://github.com/delta-io/delta) tables in Amazon S3.
+
+## Syntax
+
+``` sql
+deltaLake(url [,aws_access_key_id, aws_secret_access_key] [,format] [,structure] [,compression])
+```
+
+## Arguments
+
+- `url` — Bucket url with path to existing Delta Lake 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.
+- `structure` — Structure of the table. Format `'column1_name column1_type, column2_name column2_type, ...'`.
+- `compression` — Parameter is optional. Supported values: `none`, `gzip/gz`, `brotli/br`, `xz/LZMA`, `zstd/zst`. By default, compression will be autodetected by the file extension.
+
+**Returned value**
+
+A table with the specified structure for reading data in the specified Delta Lake table in S3.
+
+**Examples**
+
+Selecting rows from the table in S3 `https://clickhouse-public-datasets.s3.amazonaws.com/delta_lake/hits/`:
+
+``` sql
+SELECT
+    URL,
+    UserAgent
+FROM deltaLake('https://clickhouse-public-datasets.s3.amazonaws.com/delta_lake/hits/')
+WHERE URL IS NOT NULL
+LIMIT 2
+```
+
+``` response
+┌─URL───────────────────────────────────────────────────────────────────┬─UserAgent─┐
+│ http://auto.ria.ua/search/index.kz/jobinmoscow/detail/55089/hasimages │         1 │
+│ http://auto.ria.ua/search/index.kz/jobinmoscow.ru/gosushi             │         1 │
+└───────────────────────────────────────────────────────────────────────┴───────────┘
+```
+
+**See Also**
+
+- [DeltaLake engine](/docs/en/engines/table-engines/integrations/deltalake.md)
+