hendrikmuhs commented on a change in pull request #460:
URL: https://github.com/apache/lucene/pull/460#discussion_r754601969
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File path: lucene/core/src/java/org/apache/lucene/util/fst/FST.java
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@@ -1000,6 +1027,98 @@ private void writePresenceBits(
assert bytePos - dest == numPresenceBytes;
}
+ private long estimateNodeAddress(
Review comment:
That's the trickiest part of the whole idea. I need to know
[`thisNodeAddress`](https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/util/fst/FST.java#L779)
before writing the state. But because everything uses variable length
encodings, is based on flags, might write extra fields, etc. this is hard. I
considered using the position of the arc, but, the compiler reverses the bytes
it wrote.
So what I ended up with is pre-calculating the node address ("estimate" is
therefore wrong, feel free to suggest a better name, it must be exact (or
return `0`, see below), so rather "preCalculateNodeAddress").
Good to know: the heuristic is allowed to fail, in which case it returns `0`
and relative coding isn't used.
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