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Merge pull request #6788 from den-crane/patch-3

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Doc change. identity function + translation to russian for throwIf / modelEvaluate
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alexey-milovidov 2019-09-03 14:48:37 +03:00 committed by GitHub
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2 changed files with 55 additions and 4 deletions
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27
docs/en/query_language/functions/other_functions.md
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@ -409,7 +409,7 @@ WHERE diff != 1
│ 65536 │ 0 │
└────────┴──────┘
set max_block_size=100000 // default value is 65536!
set max_block_size=100000 -- default value is 65536!
SELECT
number,
@ -746,11 +746,32 @@ Gets data from [Join](../../operations/table_engines/join.md) tables using the s
Only supports tables created with the `ENGINE = Join(ANY, LEFT, <join_keys>)` statement.
## modelEvaluate(model_name, ...)
Evaluate external model.
Evaluate model.
Accepts a model name and model arguments. Returns Float64.
## throwIf(x)
## throwIf(x\[, custom_message\])
Throw an exception if the argument is non zero.
custom_message - is an optional parameter: a constant string, provides an error message
```sql
SELECT throwIf(number = 3, 'Too many') FROM numbers(10);
↙ Progress: 0.00 rows, 0.00 B (0.00 rows/s., 0.00 B/s.) Received exception from server (version 19.14.1):
Code: 395. DB::Exception: Received from localhost:9000. DB::Exception: Too many.
```
## identity()
Returns the same value that was used as its argument.
```sql
SELECT identity(42)
┌─identity(42)─┐
│ 42 │
└──────────────┘
```
Used for debugging and testing, allows to "break" access by index, and get the result and query performance for a full scan.
[Original article](https://clickhouse.yandex/docs/en/query_language/functions/other_functions/) <!--hide-->

32
docs/ru/query_language/functions/other_functions.md
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@ -386,7 +386,7 @@ WHERE diff != 1
└────────┴──────┘
set max_block_size=100000 // по умолчанию 65536!
set max_block_size=100000 -- по умолчанию 65536!
SELECT
number,
@ -721,4 +721,34 @@ SELECT filesystemAvailable() AS "Free space", toTypeName(filesystemAvailable())
Поддержаны только таблицы, созданные запросом с `ENGINE = Join(ANY, LEFT, <join_keys>)`.
## modelEvaluate(model_name, ...)
Вычислить модель.
Принимает имя модели и аргументы модели. Возвращает Float64.
## throwIf(x\[, custom_message\])
Бросает исключение, если аргумент не равен нулю.
custom_message - необязательный параметр, константная строка, задает текст сообщения об ошибке.
```sql
SELECT throwIf(number = 3, 'Too many') FROM numbers(10);
↙ Progress: 0.00 rows, 0.00 B (0.00 rows/s., 0.00 B/s.) Received exception from server (version 19.14.1):
Code: 395. DB::Exception: Received from localhost:9000. DB::Exception: Too many.
```
## identity()
Возвращает то же значение, которое использовалось в качестве аргумента.
```sql
SELECT identity(42)
┌─identity(42)─┐
│ 42 │
└──────────────┘
```
Используется для отладки и тестирования, позволяет "сломать" доступ по индексу, и получить результат и производительность запроса для полного сканирования.
[Оригинальная статья](https://clickhouse.yandex/docs/ru/query_language/functions/other_functions/) <!--hide-->