From ce364955b7d070808b4bf862dcabec04c5d4d50d Mon Sep 17 00:00:00 2001 From: Alexey Milovidov Date: Sun, 14 Mar 2021 23:19:53 +0300 Subject: [PATCH] Fix broken link --- docs/ru/sql-reference/table-functions/s3.md | 168 ++++++++++++++++++++ 1 file changed, 168 insertions(+) create mode 100644 docs/ru/sql-reference/table-functions/s3.md diff --git a/docs/ru/sql-reference/table-functions/s3.md b/docs/ru/sql-reference/table-functions/s3.md new file mode 100644 index 0000000000..2427f0f863 --- /dev/null +++ b/docs/ru/sql-reference/table-functions/s3.md @@ -0,0 +1,168 @@ +--- +toc_priority: 45 +toc_title: s3 +--- + +# s3 {#s3} + +Provides table-like interface to select/insert files in S3. This table function is similar to [hdfs](../../sql-reference/table-functions/hdfs.md). + +``` sql +s3(path, [aws_access_key_id, aws_secret_access_key,] format, structure, [compression]) +``` + +**Input parameters** + +- `path` — Bucket url with path to file. Supports following wildcards in readonly mode: *, ?, {abc,def} and {N..M} where N, M — numbers, `’abc’, ‘def’ — strings. +- `format` — The [format](../../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, it will autodetect compression by file extension. + +**Returned value** + +A table with the specified structure for reading or writing data in the specified file. + +**Example** + +Table from S3 file `https://storage.yandexcloud.net/my-test-bucket-768/data.csv` and selection of the first two rows from it: + +``` sql +SELECT * +FROM s3('https://storage.yandexcloud.net/my-test-bucket-768/data.csv', 'CSV', 'column1 UInt32, column2 UInt32, column3 UInt32') +LIMIT 2 +``` + +``` text +┌─column1─┬─column2─┬─column3─┐ +│ 1 │ 2 │ 3 │ +│ 3 │ 2 │ 1 │ +└─────────┴─────────┴─────────┘ +``` + +The similar but from file with `gzip` compression: + +``` sql +SELECT * +FROM s3('https://storage.yandexcloud.net/my-test-bucket-768/data.csv.gz', 'CSV', 'column1 UInt32, column2 UInt32, column3 UInt32', 'gzip') +LIMIT 2 +``` + +``` text +┌─column1─┬─column2─┬─column3─┐ +│ 1 │ 2 │ 3 │ +│ 3 │ 2 │ 1 │ +└─────────┴─────────┴─────────┘ +``` + +**Globs in path** + +Multiple path components can have globs. For being processed file should exists and matches to the whole path pattern (not only suffix or prefix). + +- `*` — Substitutes any number of any characters except `/` including empty string. +- `?` — Substitutes any single character. +- `{some_string,another_string,yet_another_one}` — Substitutes any of strings `'some_string', 'another_string', 'yet_another_one'`. +- `{N..M}` — Substitutes any number in range from N to M including both borders. N and M can have leading zeroes e.g. `000..078`. + +Constructions with `{}` are similar to the [remote table function](../../sql-reference/table-functions/remote.md)). + +**Example** + +1. Suppose that we have several files with following URIs on S3: + +- ‘https://storage.yandexcloud.net/my-test-bucket-768/some_prefix/some_file_1.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/some_prefix/some_file_2.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/some_prefix/some_file_3.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/some_prefix/some_file_4.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/another_prefix/some_file_1.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/another_prefix/some_file_2.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/another_prefix/some_file_3.csv’ +- ‘https://storage.yandexcloud.net/my-test-bucket-768/another_prefix/some_file_4.csv’ + +2. Query the amount of rows in files end with number from 1 to 3: + + + +``` sql +SELECT count(*) +FROM s3('https://storage.yandexcloud.net/my-test-bucket-768/{some,another}_prefix/some_file_{1..3}.csv', 'CSV', 'name String, value UInt32') +``` + +``` text +┌─count()─┐ +│ 18 │ +└─────────┘ +``` + +3. Query the amount of rows in all files of these two directories: + + + +``` sql +SELECT count(*) +FROM s3('https://storage.yandexcloud.net/my-test-bucket-768/{some,another}_prefix/*', 'CSV', 'name String, value UInt32') +``` + +``` text +┌─count()─┐ +│ 24 │ +└─────────┘ +``` + + +!!! warning "Warning" + If your listing of files contains number ranges with leading zeros, use the construction with braces for each digit separately or use `?`. + +**Example** + +Query the data from files named `file-000.csv`, `file-001.csv`, … , `file-999.csv`: + +``` sql +SELECT count(*) +FROM s3('https://storage.yandexcloud.net/my-test-bucket-768/big_prefix/file-{000..999}.csv', 'CSV', 'name String, value UInt32') +``` + +``` text +┌─count()─┐ +│ 12 │ +└─────────┘ +``` + +**Data insert** + +The S3 table function may be used for data insert as well. + +**Example** + +Insert a data into file `test-data.csv.gz`: + +``` sql +INSERT INTO s3('https://storage.yandexcloud.net/my-test-bucket-768/test-data.csv.gz', 'CSV', 'name String, value UInt32', 'gzip') +VALUES ('test-data', 1), ('test-data-2', 2) +``` + +Insert a data into file `test-data.csv.gz` from existing table: + +``` sql +INSERT INTO s3('https://storage.yandexcloud.net/my-test-bucket-768/test-data.csv.gz', 'CSV', 'name String, value UInt32', 'gzip') +SELECT name, value FROM existing_table +``` + +## Virtual Columns {#virtual-columns} + +- `_path` — Path to the file. +- `_file` — Name of the file. + +## S3-related settings {#settings} + +The following settings can be set before query execution or placed into configuration file. + +- `s3_max_single_part_upload_size` — Default value is `64Mb`. The maximum size of object to upload using singlepart upload to S3. +- `s3_min_upload_part_size` — Default value is `512Mb`. The minimum size of part to upload during multipart upload to [S3 Multipart upload](https://docs.aws.amazon.com/AmazonS3/latest/dev/uploadobjusingmpu.html). +- `s3_max_redirects` — Default value is `10`. Max number of S3 redirects hops allowed. + +Security consideration: if malicious user can specify arbitrary S3 URLs, `s3_max_redirects` must be set to zero to avoid [SSRF](https://en.wikipedia.org/wiki/Server-side_request_forgery) attacks; or alternatively, `remote_host_filter` must be specified in server configuration. + +**See Also** + +- [Virtual columns](../../engines/table-engines/index.md#table_engines-virtual_columns) + -- GitLab