mikemccand commented on code in PR #13359:
URL: https://github.com/apache/lucene/pull/13359#discussion_r1613174241
##########
lucene/core/src/java/org/apache/lucene/codecs/lucene90/blocktree/SegmentTermsEnum.java:
##########
@@ -307,6 +309,30 @@ private boolean setEOF() {
return true;
}
+ @Override
+ public void prepareSeekExact(BytesRef target) throws IOException {
+ if (fr.index == null) {
+ throw new IllegalStateException("terms index was not loaded");
+ }
+
+ if (fr.size() == 0 || target.compareTo(fr.getMin()) < 0 ||
target.compareTo(fr.getMax()) > 0) {
+ return;
+ }
+
+ // TODO: should we try to reuse the current state of this terms enum when
applicable?
+ BytesRefFSTEnum<BytesRef> indexEnum = new BytesRefFSTEnum<>(fr.index);
+ InputOutput<BytesRef> output = indexEnum.seekFloor(target);
+ if (output != null) { // should never be null since we already checked
against fr.getMin()?
+ final long code =
+ fr.readVLongOutput(
+ new ByteArrayDataInput(
+ output.output.bytes, output.output.offset,
output.output.length));
+ final long fpSeek = code >>>
Lucene90BlockTreeTermsReader.OUTPUT_FLAGS_NUM_BITS;
+ initIndexInput();
+ in.prefetch(fpSeek, 1); // TODO: could we know the length of the block?
Review Comment:
> But this will happens when we finished a `Block` and go back to read its
parent block's `term`.
Yeah I agree that the `rest` term will be back in `b2` block, but, the
`FSTEnum` we are talking about is the in-memory terms index that holds the file
pointer offset to the start of these blocks ... I would have expected the FST
to have e.g. in your example:
* `reg -> b2`
* `req -> b3`
* `rez -> b4`
Or so, with `b4 > b3 > b2` block file pointers ...
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