MDEV-21543: Speed up VARCHAR pad space handling in multibyte collations #4625
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Scoped partial optimization, for MDEV-21543, improving PAD SPACE collations for multibyte character sets, for
HA_KEYTYPE_VARTEXT1only, while keeping the old behavior for other cases until MDEV-38712 is resolved. For more info refer to this Zulip topic: #New Members > MDEV-21543 hp_rec_key_cmp suboptimal comparison