cambyzju commented on code in PR #46405:
URL: https://github.com/apache/doris/pull/46405#discussion_r1903604777
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be/src/vec/functions/function_string.h:
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@@ -3770,9 +3770,10 @@ class FunctionConvertTo : public IFunction {
auto& res_offset = col_res->get_offsets();
auto& res_chars = col_res->get_chars();
res_offset.resize(input_rows_count);
- // max pinyin size is 6, double of utf8 chinese word 3, add one char
to set '~'
- ColumnString::check_chars_length(str_chars.size() * 2 +
input_rows_count, 0);
- res_chars.resize(str_chars.size() * 2 + input_rows_count);
+ // max pinyin size is 6 + 1 (first '~') for utf8 chinese word 3
+ size_t pinyin_size = (str_chars.size() + 2) / 3 * 7;
Review Comment:
pinyin_size = chars_size / 3 * 7
but we know 1/3=0, 2/3=0, so we need: (chars_size + (3-1)) / 3 * 7
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