The tail operator:
- can only be applied to string values and byte vectors
- can only replace the end of e.g. a string value
- cannot shrink the size of a string value, only grow or remain in size
- cannot create output field value if delta value is not present in the stream
The delta operator:
- can be applied to numbers, strings and byte vectors
- can replace either the beginning or end of a string value
- can shrink the size of a string
- can use just previous or initial value (if tail value is not present in the stream) for the output field value.
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