Github user tejasapatil commented on the issue:

    https://github.com/apache/spark/pull/19222
  
    I pulled up frequency of methods from `UTF8String` which are being invoked 
from FB prod clusters and picked top 25.
    
    ```
    .writeToMemory()
    .getBytes()
    .toString()
    .fromString()
    .clone()
    .toLong()
    .fromString()
    .translate()
    .compare()
    .getByte()
    .compareTo()
    .fromAddress()
    .getBytes()
    .fromBytes()
    .<init>()
    .substringSQL()
    .substring()
    .fromBytes()
    .fromAddress()
    .equals()
    .compareTo()
    .compare()
    .toString()
    .hashCode()
    .toInt()
    ```


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