Details
Description
Unique index key format would be changed to enable PIT reads from secondary. As a result, unique indexes could have both old and new format keys after an upgrade. Reading keys from mixed format index requires distinguishing old and new format keys.
Index keys are stored as KeyString objects. To read keys correctly from mixed format indexes, a function was written to decode the KeyString and calculate the size of key.
This ticket aims to add comprehensive test for this new KeyString length decoding function.