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Merge pull request #28194 from ka1bi4/romanzhukov-DOCSUP-12543-bin-unbin-functions
This commit is contained in:
Vladimir C
GitHub
commit
aee967de3d
@ -87,7 +87,23 @@ The function is using uppercase letters `A-F` and not using any prefixes (like `
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For integer arguments, it prints hex digits (“nibbles”) from the most significant to least significant (big-endian or “human-readable” order). It starts with the most significant non-zero byte (leading zero bytes are omitted) but always prints both digits of every byte even if the leading digit is zero.
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**Example**
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Values of type [Date](../../sql-reference/data-types/date.md) and [DateTime](../../sql-reference/data-types/datetime.md) are formatted as corresponding integers (the number of days since Epoch for Date and the value of Unix Timestamp for DateTime).
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For [String](../../sql-reference/data-types/string.md) and [FixedString](../../sql-reference/data-types/fixedstring.md), all bytes are simply encoded as two hexadecimal numbers. Zero bytes are not omitted.
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Values of [Float](../../sql-reference/data-types/float.md) and [Decimal](../../sql-reference/data-types/decimal.md) types are encoded as their representation in memory. As we support little-endian architecture, they are encoded in little-endian. Zero leading/trailing bytes are not omitted.
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**Arguments**
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- `arg` — A value to convert to hexadecimal. Types: [String](../../sql-reference/data-types/string.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md) or [DateTime](../../sql-reference/data-types/datetime.md).
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**Returned value**
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- A string with the hexadecimal representation of the argument.
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Type: [String](../../sql-reference/data-types/string.md).
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**Examples**
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Query:
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@ -101,28 +117,10 @@ Result:
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01
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```
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Values of type `Date` and `DateTime` are formatted as corresponding integers (the number of days since Epoch for Date and the value of Unix Timestamp for DateTime).
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For `String` and `FixedString`, all bytes are simply encoded as two hexadecimal numbers. Zero bytes are not omitted.
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Values of floating point and Decimal types are encoded as their representation in memory. As we support little-endian architecture, they are encoded in little-endian. Zero leading/trailing bytes are not omitted.
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**Arguments**
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- `arg` — A value to convert to hexadecimal. Types: [String](../../sql-reference/data-types/string.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md) or [DateTime](../../sql-reference/data-types/datetime.md).
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**Returned value**
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- A string with the hexadecimal representation of the argument.
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Type: `String`.
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**Example**
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Query:
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``` sql
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SELECT hex(toFloat32(number)) as hex_presentation FROM numbers(15, 2);
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SELECT hex(toFloat32(number)) AS hex_presentation FROM numbers(15, 2);
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```
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Result:
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@ -137,7 +135,7 @@ Result:
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Query:
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``` sql
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SELECT hex(toFloat64(number)) as hex_presentation FROM numbers(15, 2);
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SELECT hex(toFloat64(number)) AS hex_presentation FROM numbers(15, 2);
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```
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Result:
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@ -210,52 +208,52 @@ Result:
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Returns a string containing the argument’s binary representation.
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Alias: `BIN`.
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**Syntax**
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``` sql
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bin(arg)
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```
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Alias: `BIN`.
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For integer arguments, it prints bin digits from the most significant to least significant (big-endian or “human-readable” order). It starts with the most significant non-zero byte (leading zero bytes are omitted) but always prints eight digits of every byte if the leading digit is zero.
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**Example**
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Values of type [Date](../../sql-reference/data-types/date.md) and [DateTime](../../sql-reference/data-types/datetime.md) are formatted as corresponding integers (the number of days since Epoch for `Date` and the value of Unix Timestamp for `DateTime`).
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Query:
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For [String](../../sql-reference/data-types/string.md) and [FixedString](../../sql-reference/data-types/fixedstring.md), all bytes are simply encoded as eight binary numbers. Zero bytes are not omitted.
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``` sql
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SELECT bin(1);
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```
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Result:
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``` text
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00000001
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```
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Values of type `Date` and `DateTime` are formatted as corresponding integers (the number of days since Epoch for Date and the value of Unix Timestamp for DateTime).
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For `String` and `FixedString`, all bytes are simply encoded as eight binary numbers. Zero bytes are not omitted.
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Values of floating-point and Decimal types are encoded as their representation in memory. As we support little-endian architecture, they are encoded in little-endian. Zero leading/trailing bytes are not omitted.
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Values of [Float](../../sql-reference/data-types/float.md) and [Decimal](../../sql-reference/data-types/decimal.md) types are encoded as their representation in memory. As we support little-endian architecture, they are encoded in little-endian. Zero leading/trailing bytes are not omitted.
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**Arguments**
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- `arg` — A value to convert to binary. Types: [String](../../sql-reference/data-types/string.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md) or [DateTime](../../sql-reference/data-types/datetime.md).
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- `arg` — A value to convert to binary. [String](../../sql-reference/data-types/string.md), [FixedString](../../sql-reference/data-types/fixedstring.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md), or [DateTime](../../sql-reference/data-types/datetime.md).
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**Returned value**
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- A string with the binary representation of the argument.
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Type: `String`.
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Type: [String](../../sql-reference/data-types/string.md).
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**Example**
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**Examples**
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Query:
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``` sql
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SELECT bin(toFloat32(number)) as bin_presentation FROM numbers(15, 2);
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SELECT bin(14);
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```
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Result:
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``` text
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┌─bin(14)──┐
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│ 00001110 │
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└──────────┘
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```
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Query:
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``` sql
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SELECT bin(toFloat32(number)) AS bin_presentation FROM numbers(15, 2);
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```
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Result:
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@ -270,7 +268,7 @@ Result:
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Query:
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``` sql
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SELECT bin(toFloat64(number)) as bin_presentation FROM numbers(15, 2);
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SELECT bin(toFloat64(number)) AS bin_presentation FROM numbers(15, 2);
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```
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Result:
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@ -284,14 +282,7 @@ Result:
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## unbin {#unbinstr}
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Performs the opposite operation of [bin](#bin). It interprets each pair of binary digits (in the argument) as a number and converts it to the byte represented by the number. The return value is a binary string (BLOB).
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If you want to convert the result to a number, you can use the [reverse](../../sql-reference/functions/string-functions.md#reverse) and [reinterpretAs<Type>](../../sql-reference/functions/type-conversion-functions.md#type-conversion-functions) functions.
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!!! note "Note"
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If `unbin` is invoked from within the `clickhouse-client`, binary strings display using UTF-8.
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Alias: `UNBIN`.
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Interprets each pair of binary digits (in the argument) as a number and converts it to the byte represented by the number. The functions performs the opposite operation to [bin](#bin).
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**Syntax**
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@ -299,11 +290,18 @@ Alias: `UNBIN`.
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unbin(arg)
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```
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Alias: `UNBIN`.
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For a numeric argument `unbin()` does not return the inverse of `bin()`. If you want to convert the result to a number, you can use the [reverse](../../sql-reference/functions/string-functions.md#reverse) and [reinterpretAs<Type>](../../sql-reference/functions/type-conversion-functions.md#reinterpretasuint8163264) functions.
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!!! note "Note"
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If `unbin` is invoked from within the `clickhouse-client`, binary strings are displayed using UTF-8.
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Supports binary digits `0` and `1`. The number of binary digits does not have to be multiples of eight. If the argument string contains anything other than binary digits, some implementation-defined result is returned (an exception isn’t thrown).
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**Arguments**
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- `arg` — A string containing any number of binary digits. Type: [String](../../sql-reference/data-types/string.md).
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Supports binary digits `0-1`. The number of binary digits does not have to be multiples of eight. If the argument string contains anything other than binary digits, some implementation-defined result is returned (an exception isn’t thrown). For a numeric argument the inverse of bin(N) is not performed by unbin().
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- `arg` — A string containing any number of binary digits. [String](../../sql-reference/data-types/string.md).
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**Returned value**
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@ -311,7 +309,7 @@ Supports binary digits `0-1`. The number of binary digits does not have to be mu
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Type: [String](../../sql-reference/data-types/string.md).
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**Example**
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**Examples**
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Query:
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@ -330,14 +328,14 @@ Result:
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Query:
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``` sql
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SELECT reinterpretAsUInt64(reverse(unbin('1010'))) AS num;
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SELECT reinterpretAsUInt64(reverse(unbin('1110'))) AS num;
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```
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Result:
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``` text
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┌─num─┐
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│ 10 │
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│ 14 │
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└─────┘
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```
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@ -396,7 +394,7 @@ Result:
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Query:
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``` sql
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select bitPositionsToArray(toInt8(-1)) as bit_positions;
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SELECT bitPositionsToArray(toInt8(-1)) AS bit_positions;
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```
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Result:
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@ -17,13 +17,13 @@ char(number_1, [number_2, ..., number_n]);
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**Аргументы**
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- `number_1, number_2, ..., number_n` — числовые аргументы, которые интерпретируются как целые числа. Типы: [Int](../../sql-reference/functions/encoding-functions.md), [Float](../../sql-reference/functions/encoding-functions.md).
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- `number_1, number_2, ..., number_n` — числовые аргументы, которые интерпретируются как целые числа. Типы: [Int](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md).
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**Возвращаемое значение**
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- Строка из соответствующих байт.
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Тип: `String`.
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Тип: [String](../../sql-reference/data-types/string.md).
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**Пример**
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@ -73,61 +73,57 @@ SELECT char(0xE4, 0xBD, 0xA0, 0xE5, 0xA5, 0xBD) AS hello;
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## hex {#hex}
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Returns a string containing the argument’s hexadecimal representation.
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Возвращает строку, содержащую шестнадцатеричное представление аргумента.
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Синоним: `HEX`.
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**Syntax**
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**Синтаксис**
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``` sql
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hex(arg)
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```
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The function is using uppercase letters `A-F` and not using any prefixes (like `0x`) or suffixes (like `h`).
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Функция использует прописные буквы `A-F` и не использует никаких префиксов (например, `0x`) или суффиксов (например, `h`).
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For integer arguments, it prints hex digits («nibbles») from the most significant to least significant (big endian or «human readable» order). It starts with the most significant non-zero byte (leading zero bytes are omitted) but always prints both digits of every byte even if leading digit is zero.
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Для целочисленных аргументов возвращает шестнадцатеричные цифры от наиболее до наименее значимых (`big endian`, человекочитаемый порядок).Он начинается с самого значимого ненулевого байта (начальные нулевые байты опущены), но всегда выводит обе цифры каждого байта, даже если начальная цифра равна нулю.
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Example:
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Значения типа [Date](../../sql-reference/data-types/date.md) и [DateTime](../../sql-reference/data-types/datetime.md) формируются как соответствующие целые числа (количество дней с момента Unix-эпохи для `Date` и значение Unix Timestamp для `DateTime`).
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**Example**
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Для [String](../../sql-reference/data-types/string.md) и [FixedString](../../sql-reference/data-types/fixedstring.md), все байты просто кодируются как два шестнадцатеричных числа. Нулевые байты не опущены.
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Query:
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Значения [Float](../../sql-reference/data-types/float.md) и [Decimal](../../sql-reference/data-types/decimal.md) кодируются как их представление в памяти. Поскольку ClickHouse поддерживает архитектуру `little-endian`, они кодируются от младшего к старшему байту. Нулевые начальные/конечные байты не опущены.
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**Аргументы**
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- `arg` — значение для преобразования в шестнадцатеричное. [String](../../sql-reference/data-types/string.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md) или [DateTime](../../sql-reference/data-types/datetime.md).
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**Возвращаемое значение**
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- Строка — шестнадцатеричное представление аргумента.
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Тип: [String](../../sql-reference/data-types/string.md).
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**Примеры**
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Запрос:
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``` sql
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SELECT hex(1);
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```
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Result:
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Результат:
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``` text
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01
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```
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Values of type `Date` and `DateTime` are formatted as corresponding integers (the number of days since Epoch for Date and the value of Unix Timestamp for DateTime).
|
||||
|
||||
For `String` and `FixedString`, all bytes are simply encoded as two hexadecimal numbers. Zero bytes are not omitted.
|
||||
|
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Values of floating point and Decimal types are encoded as their representation in memory. As we support little endian architecture, they are encoded in little endian. Zero leading/trailing bytes are not omitted.
|
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|
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**Parameters**
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- `arg` — A value to convert to hexadecimal. Types: [String](../../sql-reference/functions/encoding-functions.md), [UInt](../../sql-reference/functions/encoding-functions.md), [Float](../../sql-reference/functions/encoding-functions.md), [Decimal](../../sql-reference/functions/encoding-functions.md), [Date](../../sql-reference/functions/encoding-functions.md) or [DateTime](../../sql-reference/functions/encoding-functions.md).
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**Returned value**
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- A string with the hexadecimal representation of the argument.
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Type: `String`.
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|
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**Example**
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Query:
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Запрос:
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``` sql
|
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SELECT hex(toFloat32(number)) as hex_presentation FROM numbers(15, 2);
|
||||
SELECT hex(toFloat32(number)) AS hex_presentation FROM numbers(15, 2);
|
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```
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||||
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||||
Result:
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||||
Результат:
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||||
|
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``` text
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||||
┌─hex_presentation─┐
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||||
@ -136,13 +132,13 @@ Result:
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||||
└──────────────────┘
|
||||
```
|
||||
|
||||
Query:
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT hex(toFloat64(number)) as hex_presentation FROM numbers(15, 2);
|
||||
SELECT hex(toFloat64(number)) AS hex_presentation FROM numbers(15, 2);
|
||||
```
|
||||
|
||||
Result:
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||||
Результат:
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||||
|
||||
``` text
|
||||
┌─hex_presentation─┐
|
||||
@ -208,6 +204,141 @@ SELECT reinterpretAsUInt64(reverse(unhex('FFF'))) AS num;
|
||||
└──────┘
|
||||
```
|
||||
|
||||
## bin {#bin}
|
||||
|
||||
Возвращает строку, содержащую бинарное представление аргумента.
|
||||
|
||||
**Синтаксис**
|
||||
|
||||
``` sql
|
||||
bin(arg)
|
||||
```
|
||||
|
||||
Синоним: `BIN`.
|
||||
|
||||
Для целочисленных аргументов возвращаются двоичные числа от наиболее значимого до наименее значимого (`big-endian`, человекочитаемый порядок). Порядок начинается с самого значимого ненулевого байта (начальные нулевые байты опущены), но всегда возвращает восемь цифр каждого байта, если начальная цифра равна нулю.
|
||||
|
||||
Значения типа [Date](../../sql-reference/data-types/date.md) и [DateTime](../../sql-reference/data-types/datetime.md) формируются как соответствующие целые числа (количество дней с момента Unix-эпохи для `Date` и значение Unix Timestamp для `DateTime`).
|
||||
|
||||
Для [String](../../sql-reference/data-types/string.md) и [FixedString](../../sql-reference/data-types/fixedstring.md) все байты кодируются как восемь двоичных чисел. Нулевые байты не опущены.
|
||||
|
||||
Значения [Float](../../sql-reference/data-types/float.md) и [Decimal](../../sql-reference/data-types/decimal.md) кодируются как их представление в памяти. Поскольку ClickHouse поддерживает архитектуру `little-endian`, они кодируются от младшего к старшему байту. Нулевые начальные/конечные байты не опущены.
|
||||
|
||||
**Аргументы**
|
||||
|
||||
- `arg` — значение для преобразования в двоичный код. [String](../../sql-reference/data-types/string.md), [FixedString](../../sql-reference/data-types/fixedstring.md), [UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md), [Decimal](../../sql-reference/data-types/decimal.md), [Date](../../sql-reference/data-types/date.md) или [DateTime](../../sql-reference/data-types/datetime.md).
|
||||
|
||||
**Возвращаемое значение**
|
||||
|
||||
- Бинарная строка (BLOB) — двоичное представление аргумента.
|
||||
|
||||
Тип: [String](../../sql-reference/data-types/string.md).
|
||||
|
||||
**Примеры**
|
||||
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT bin(14);
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
``` text
|
||||
┌─bin(14)──┐
|
||||
│ 00001110 │
|
||||
└──────────┘
|
||||
```
|
||||
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT bin(toFloat32(number)) AS bin_presentation FROM numbers(15, 2);
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
``` text
|
||||
┌─bin_presentation─────────────────┐
|
||||
│ 00000000000000000111000001000001 │
|
||||
│ 00000000000000001000000001000001 │
|
||||
└──────────────────────────────────┘
|
||||
```
|
||||
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT bin(toFloat64(number)) AS bin_presentation FROM numbers(15, 2);
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
``` text
|
||||
┌─bin_presentation─────────────────────────────────────────────────┐
|
||||
│ 0000000000000000000000000000000000000000000000000010111001000000 │
|
||||
│ 0000000000000000000000000000000000000000000000000011000001000000 │
|
||||
└──────────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
## unbin {#unbinstr}
|
||||
|
||||
Интерпретирует каждую пару двоичных цифр аргумента как число и преобразует его в байт, представленный числом. Функция выполняет операцию, противоположную [bin](#bin).
|
||||
|
||||
**Синтаксис**
|
||||
|
||||
``` sql
|
||||
unbin(arg)
|
||||
```
|
||||
|
||||
Синоним: `UNBIN`.
|
||||
|
||||
Для числового аргумента `unbin()` не возвращает значение, обратное результату `bin()`. Чтобы преобразовать результат в число, используйте функции [reverse](../../sql-reference/functions/string-functions.md#reverse) и [reinterpretAs<Type>](../../sql-reference/functions/type-conversion-functions.md#reinterpretasuint8163264).
|
||||
|
||||
!!! note "Примечание"
|
||||
Если `unbin` вызывается из клиента `clickhouse-client`, бинарная строка возвращается в кодировке UTF-8.
|
||||
|
||||
Поддерживает двоичные цифры `0` и `1`. Количество двоичных цифр не обязательно должно быть кратно восьми. Если строка аргумента содержит что-либо, кроме двоичных цифр, возвращается некоторый результат, определенный реализацией (ошибки не возникает).
|
||||
|
||||
**Аргументы**
|
||||
|
||||
- `arg` — строка, содержащая любое количество двоичных цифр. [String](../../sql-reference/data-types/string.md).
|
||||
|
||||
**Возвращаемое значение**
|
||||
|
||||
- Бинарная строка (BLOB).
|
||||
|
||||
Тип: [String](../../sql-reference/data-types/string.md).
|
||||
|
||||
**Примеры**
|
||||
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT UNBIN('001100000011000100110010'), UNBIN('0100110101111001010100110101000101001100');
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
``` text
|
||||
┌─unbin('001100000011000100110010')─┬─unbin('0100110101111001010100110101000101001100')─┐
|
||||
│ 012 │ MySQL │
|
||||
└───────────────────────────────────┴───────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
SELECT reinterpretAsUInt64(reverse(unbin('1110'))) AS num;
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
``` text
|
||||
┌─num─┐
|
||||
│ 14 │
|
||||
└─────┘
|
||||
```
|
||||
|
||||
## UUIDStringToNum(str) {#uuidstringtonumstr}
|
||||
|
||||
Принимает строку, содержащую 36 символов в формате `123e4567-e89b-12d3-a456-426655440000`, и возвращает в виде набора байт в FixedString(16).
|
||||
@ -263,7 +394,7 @@ SELECT bitPositionsToArray(toInt8(1)) AS bit_positions;
|
||||
Запрос:
|
||||
|
||||
``` sql
|
||||
select bitPositionsToArray(toInt8(-1)) as bit_positions;
|
||||
SELECT bitPositionsToArray(toInt8(-1)) AS bit_positions;
|
||||
```
|
||||
|
||||
Результат:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user