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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 * Lost blank lines * Add new logo sizes * update presentations * Next step in migrating to new documentation * Fix all warnings in en reference * Fix all warnings in ru reference * Re-arrange existing reference * Move operation tips to main reference * Fix typos noticed by milovidov@ * Get rid of zookeeper.md * Looks like duplicate of tutorial.html * Fix some mess with html tags in tutorial * No idea why nobody noticed this before, but it was completely not clear whet to get the data * Match code block styling between main and tutorial pages (in favor of the latter) * Get rid of some copypaste in tutorial * Normalize header styles * Move example_datasets to sphinx * Move presentations submodule to website * Move and update README.md * No point in duplicating articles from habrahabr here * Move development-related docs as is for now * doc/reference/ -> docs/ (to match the URL on website) * Adapt links to match the previous commit * Adapt development docs to rst (still lacks translation and strikethrough support) * clean on release * blacklist presentations in gulp * strikethrough support in sphinx * just copy development folder for now * fix weird introduction in style article * Style guide translation (WIP) * Finish style guide translation to English * gulp clean separately * Update year in LICENSE * Initial CONTRIBUTING.md * Fix remaining links to old docs in tutorial * Some tutorial fixes * Typo * Another typo * Update list of authors from yandex-team accoding to git log
75 lines
3.1 KiB
ReStructuredText
75 lines
3.1 KiB
ReStructuredText
Functions for working with strings
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----------------------------------
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empty
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~~~~~
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Returns 1 for an empty string or 0 for a non-empty string.
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The result type is UInt8.
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A string is considered non-empty if it contains at least one byte, even if this is a space or a null byte.
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The function also works for arrays.
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notEmpty
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~~~~~~~~
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Returns 0 for an empty string or 1 for a non-empty string.
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The result type is UInt8.
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The function also works for arrays.
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length
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~~~~~~
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Returns the length of a string in bytes (not in characters, and not in code points).
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The result type is UInt64.
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The function also works for arrays.
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lengthUTF8
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~~~~~~~~~~
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Returns the length of a string in Unicode code points (not in characters), assuming that the string contains a set of bytes that make up UTF-8 encoded text. If this assumption is not met, it returns some result (it doesn't throw an exception).
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The result type is UInt64.
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lower
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~~~~~
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Converts ASCII Latin symbols in a string to lowercase.
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upper
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~~~~~
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Converts ASCII Latin symbols in a string to uppercase.
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lowerUTF8
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~~~~~~~~~
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Converts a string to lowercase, assuming the string contains a set of bytes that make up a UTF-8 encoded text. It doesn't detect the language. So for Turkish the result might not be exactly correct.
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If length of UTF-8 sequence is different for upper and lower case of code point, then result for that code point could be incorrect.
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If value contains invalid UTF-8, the behavior is unspecified.
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upperUTF8
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~~~~~~~~~
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Converts a string to uppercase, assuming the string contains a set of bytes that make up a UTF-8 encoded text. It doesn't detect the language. So for Turkish the result might not be exactly correct.
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If length of UTF-8 sequence is different for upper and lower case of code point, then result for that code point could be incorrect.
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If value contains invalid UTF-8, the behavior is unspecified.
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reverse
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~~~~~~~
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Reverses the string (as a sequence of bytes).
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reverseUTF8
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~~~~~~~~~~~
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Reverses a sequence of Unicode code points, assuming that the string contains a set of bytes representing a UTF-8 text. Otherwise, it does something else (it doesn't throw an exception).
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concat(s1, s2, ...)
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~~~~~~~~~~~~~~~~~~~
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Concatenates strings from the function arguments, without a separator.
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substring(s, offset, length)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Returns a substring starting with the byte from the 'offset' index that is 'length' bytes long. Character indexing starts from one (as in standard SQL). The 'offset' and 'length' arguments must be constants.
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substringUTF8(s, offset, length)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The same as 'substring', but for Unicode code points. Works under the assumption that the string contains a set of bytes representing a UTF-8 encoded text. If this assumption is not met, it returns some result (it doesn't throw an exception).
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appendTrailingCharIfAbsent(s, c)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If the ``s`` string is non-empty and does not contain the ``c`` character at the end, it appends the ``c`` character to the end.
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convertCharset(s, from, to)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Returns a string with the data s (encoded as from charset) that was converted to the to charset.
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