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MDEV-30879 Add support for up to BASE 62 to CONV()
BASE 62 uses 0-9, A-Z and then a-z to give the numbers 0-61. This patch increases the range of the string functions to cover this. Based on ideas and tests in PR #2589, but re-written into the charset functions. Includes fix by Sergei, UBSAN complained: ctype-simple.c:683:38: runtime error: negation of -9223372036854775808 cannot be represented in type 'long long int'; cast to an unsigned type to negate this value to itself Co-authored-by: Weijun Huang <huangweijun1001@gmail.com> Co-authored-by: Sergei Golubchik <serg@mariadb.org>
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