Returns a name that identifies this compaction filter.
The name will be printed to LOG file on start up for diagnosis.
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The compaction process invokes this
method for kv that is being compacted. The application can inspect
the existing value of the key and make decision based on it.
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Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.