shubhamvishu commented on code in PR #12653:
URL: https://github.com/apache/lucene/pull/12653#discussion_r1365782486
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lucene/core/src/java/org/apache/lucene/codecs/MultiLevelSkipListWriter.java:
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@@ -63,24 +63,23 @@ public abstract class MultiLevelSkipListWriter {
/** for every skip level a different buffer is used */
private ByteBuffersDataOutput[] skipBuffer;
+ /** Length of the window at which the skips are placed on skip level 1 */
+ private final long windowLength;
+
/** Creates a {@code MultiLevelSkipListWriter}. */
protected MultiLevelSkipListWriter(
int skipInterval, int skipMultiplier, int maxSkipLevels, int df) {
this.skipInterval = skipInterval;
this.skipMultiplier = skipMultiplier;
- int numberOfSkipLevels;
+ int numberOfSkipLevels = 1;
// calculate the maximum number of skip levels for this document frequency
- if (df <= skipInterval) {
- numberOfSkipLevels = 1;
- } else {
- numberOfSkipLevels = 1 + MathUtil.log(df / skipInterval, skipMultiplier);
- }
-
- // make sure it does not exceed maxSkipLevels
- if (numberOfSkipLevels > maxSkipLevels) {
- numberOfSkipLevels = maxSkipLevels;
+ if (df > skipInterval) {
+ // also make sure it does not exceed maxSkipLevels
+ numberOfSkipLevels =
+ Math.min(1 + MathUtil.log(df / skipInterval, skipMultiplier),
maxSkipLevels);
}
Review Comment:
Interesting points! I agree it makes it easy to read at first galnce.
> It also makes final possible. (Hmm in your previous approach this instance
variable was also final? And javac did not complain that it was being assigned
twice? Curious...).
Actually it was not the instance variable that you are thinking of and
rather was a local variable with duplicate name(i.e. `numberOfSkipLevels`)
which was totally unnecessary here so I cleaned that up as well.
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