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* update presentations * CLICKHOUSE-2936: redirect from clickhouse.yandex.ru and clickhouse.yandex.com * update submodule * lost files * CLICKHOUSE-2981: prefer sphinx docs over original reference * CLICKHOUSE-2981: docs styles more similar to main website + add flags to switch language links * update presentations * Less confusing directory structure (docs -> doc/reference/) * Minify sphinx docs too * Website release script: fail fast + pass docker hash on deploy * Do not underline links in docs * shorter * cleanup docker images * tune nginx config * CLICKHOUSE-3043: get rid of habrastorage links * Lost translation * CLICKHOUSE-2936: temporary client-side redirect * behaves weird in test * put redirect back * CLICKHOUSE-3047: copy docs txts to public too * move to proper file * remove old pages to avoid confusion * Remove reference redirect warning for now * Refresh README.md * Yellow buttons in docs * Use svg flags instead of unicode ones in docs * fix test website instance * Put flags to separate files * wrong flag * Copy Yandex.Metrica introduction from main page to docs * Yet another home page structure change, couple new blocks (CLICKHOUSE-3045) * Update Contacts section * CLICKHOUSE-2849: more detailed legal information * CLICKHOUSE-2978 preparation - split by files * More changes in Contacts block * Tune texts on index page * update presentations * One more benchmark * Add usage sections to index page, adapted from slides * Get the roadmap started, based on slides from last ClickHouse Meetup * CLICKHOUSE-2977: some rendering tuning * Get rid of excessive section in the end of getting started * Make headers linkable * CLICKHOUSE-2981: links to editing reference - https://github.com/yandex/ClickHouse/issues/849 * CLICKHOUSE-2981: fix mobile styles in docs * Ban crawling of duplicating docs * Open some external links in new tab * Ban old docs too * Lots of trivial fixes in english docs * Lots of trivial fixes in russian docs * Remove getting started copies in markdown * Add Yandex.Webmaster * Fix some sphinx warnings * More warnings fixed in english docs * More sphinx warnings fixed * Add code-block:: text * More code-block:: text * These headers look not that well * Better switch between documentation languages * merge use_case.rst into ya_metrika_task.rst * Edit the agg_functions.rst texts * Add lost empty lines
32 lines
2.0 KiB
ReStructuredText
32 lines
2.0 KiB
ReStructuredText
Encoding functions
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------------------
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hex
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~~~
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Accepts a string, number, date, or date with time. Returns a string containing the argument's hexadecimal representation. Uses uppercase letters A-F.
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Doesn't use ``0x`` prefixes or ``h`` suffixes.
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For strings, all bytes are simply encoded as two hexadecimal numbers. Numbers are converted to big endian ("human readable") format.
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For numbers, older zeros are trimmed, but only by entire bytes.
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For example, ``hex(1) = '01'``. Dates are encoded as the number of days since the beginning of the Unix Epoch. Dates with times are encoded as the number of seconds since the beginning of the Unix Epoch.
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unhex(str)
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~~~~~~~~~~
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Accepts a string containing any number of hexadecimal digits, and returns a string containing the corresponding bytes. Supports both uppercase and lowercase letters A-F. The number of hexadecimal digits doesn't have to be even. If it is odd, the last digit is interpreted as the younger half of the 00-0F byte. If the argument string contains anything other than hexadecimal digits, some implementation-defined result is returned (an exception isn't thrown).
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If you want to convert the result to a number, you can use the functions 'reverse' and 'reinterpretAsType'
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UUIDStringToNum(str)
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~~~~~~~~~~~~~~~~~~~~
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Accepts a string containing the UUID in the text format (``123e4567-e89b-12d3-a456-426655440000``). Returns a binary representation of the UUID in ``FixedString(16)``.
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UUIDNumToString(str)
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~~~~~~~~~~~~~~~~~~~~
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Accepts a FixedString(16) value containing the UUID in the binary format. Returns a readable string containing the UUID in the text format.
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bitmaskToList(num)
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~~~~~~~~~~~~~~~~~~
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Accepts an integer. Returns a string containing the list of powers of two that total the source number when summed. They are comma-separated without spaces in text format, in ascending order.
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bitmaskToArray(num)
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~~~~~~~~~~~~~~~~~~~
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Accepts an integer. Returns an array of UInt64 numbers containing the list of powers of two that total the source number when summed. Numbers in the array are in ascending order.
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