Handle unicode whitespace characters in lexer #68
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Add isClickHouseWhitespace() to recognize characters that ClickHouse treats as whitespace but Go's unicode.IsSpace() does not: U+FEFF BOM, U+180E Mongolian Vowel Separator, U+200B Zero Width Space, U+200C Zero Width Non-Joiner, U+200D Zero Width Joiner, and U+2060 Word Joiner. This fixes the 01280_unicode_whitespaces_lexer test case stmt3.
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Add isClickHouseWhitespace() to recognize characters that ClickHouse
treats as whitespace but Go's unicode.IsSpace() does not: U+FEFF BOM,
U+180E Mongolian Vowel Separator, U+200B Zero Width Space, U+200C Zero
Width Non-Joiner, U+200D Zero Width Joiner, and U+2060 Word Joiner.
This fixes the 01280_unicode_whitespaces_lexer test case stmt3.