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* Additional .gitignore entries * Merge a bunch of small articles about system tables into single one * Merge a bunch of small articles about formats into single one * Adapt table with formats to English docs too * Add SPb meetup link to main page * Move Utilities out of top level of docs (the location is probably not yet final) + translate couple articles * Merge MacOS.md into build_osx.md * Move Data types higher in ToC * Publish changelog on website alongside documentation * Few fixes for en/table_engines/file.md * Use smaller header sizes in changelogs * Group up table engines inside ToC * Move table engines out of top level too * Specificy in ToC that query language is SQL based. Thats a bit excessive, but catches eye. * Move stuff that is part of query language into respective folder * Move table functions lower in ToC * Lost redirects.txt update * Do not rely on comments in yaml + fix few ru titles * Extract major parts of queries.md into separate articles * queries.md has been supposed to be removed * Fix weird translation * Fix a bunch of links * There is only table of contents left * "Query language" is actually part of SQL abbreviation * Change filename in README.md too * fix mistype
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Functions for splitting and merging strings and arrays
splitByChar(separator, s)
Splits a string into substrings separated by 'separator'.'separator' must be a string constant consisting of exactly one character. Returns an array of selected substrings. Empty substrings may be selected if the separator occurs at the beginning or end of the string, or if there are multiple consecutive separators.
splitByString(separator, s)
The same as above, but it uses a string of multiple characters as the separator. The string must be non-empty.
arrayStringConcat(arr[, separator])
Concatenates the strings listed in the array with the separator.'separator' is an optional parameter: a constant string, set to an empty string by default. Returns the string.
alphaTokens(s)
Selects substrings of consecutive bytes from the ranges a-z and A-Z.Returns an array of substrings.