PS-10072 Fix extend varchar bug when using column_format compressed#5649
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https://perconadev.atlassian.net/browse/PS-10072 When modifying the metadata of a compressed column, if only the length metadata is modified, the new threshold is no longer 256, but 254, which needs to be reduced by the length of the compressed column header.
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https://perconadev.atlassian.net/browse/PS-10072
When modifying the metadata of a compressed column, if only the length metadata is modified, the new threshold is no longer 256, but 254, which needs to be reduced by the length of the compressed column header.