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Merge pull request #37533 from ClickHouse/fixes-architecture-doc

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Update architecture.md
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Alexey Milovidov 2022-05-25 21:57:26 +03:00 committed by GitHub
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@ -121,7 +121,7 @@ There are ordinary functions and aggregate functions. For aggregate functions, s
Ordinary functions do not change the number of rows – they work as if they are processing each row independently. In fact, functions are not called for individual rows, but for `Block`’s of data to implement vectorized query execution.
There are some miscellaneous functions, like [blockSize](../sql-reference/functions/other-functions.md#function-blocksize), [rowNumberInBlock](../sql-reference/functions/other-functions.md#function-rownumberinblock), and [runningAccumulate](../sql-reference/functions/other-functions.md#runningaccumulate), that exploit block processing and violate the independence of rows.
There are some miscellaneous functions, like [blockSize](../sql-reference/functions/other-functions.md#blocksize-function-blocksize), [rowNumberInBlock](../sql-reference/functions/other-functions.md#rownumberinblock-function-rownumberinblock), and [runningAccumulate](../sql-reference/functions/other-functions.md#runningaccumulate-runningaccumulate), that exploit block processing and violate the independence of rows.
ClickHouse has strong typing, so there’s no implicit type conversion. If a function does not support a specific combination of types, it throws an exception. But functions can work (be overloaded) for many different combinations of types. For example, the `plus` function (to implement the `+` operator) works for any combination of numeric types: `UInt8` + `Float32`, `UInt16` + `Int8`, and so on. Also, some variadic functions can accept any number of arguments, such as the `concat` function.