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MDEV-29019 Assertion `(length % 4) == 0' failed in my_lengthsp_utf32 …
…on SELECT Problem: Item_func_conv::val_str() copied the ASCII string with the numeric base conversion result directly to the function result string. In case of a tricky character set (e.g. utf32) it produced an illformed string. Fix: Copy the base conversion result to the function result as is only if the function character set is ASCII compatible, go through a character set conversion otherwise.
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