jpountz commented on code in PR #13224:
URL: https://github.com/apache/lucene/pull/13224#discussion_r1543602422
##########
lucene/core/src/test/org/apache/lucene/util/packed/TestDirectMonotonic.java:
##########
@@ -154,6 +154,43 @@ public void testConstantSlope() throws IOException {
dir.close();
}
+ public void testZeroValuesSmallBlobShift() throws IOException {
+ Directory dir = newDirectory();
+ final int numValues = TestUtil.nextInt(random(), 8, 1 << 20);
+ // use blockShift < log2(numValues)
+ final int blockShift =
+ TestUtil.nextInt(
+ random(),
+ DirectMonotonicWriter.MIN_BLOCK_SHIFT,
+ Math.toIntExact(Math.round(Math.log(numValues) / Math.log(2))) -
1);
+
+ final long dataLength;
+ try (IndexOutput metaOut = dir.createOutput("meta", IOContext.DEFAULT);
+ IndexOutput dataOut = dir.createOutput("data", IOContext.DEFAULT)) {
+ DirectMonotonicWriter w =
+ DirectMonotonicWriter.getInstance(metaOut, dataOut, numValues,
blockShift);
+ for (int i = 0; i < numValues; i++) {
+ w.add(0);
+ }
+ w.finish();
+ dataLength = dataOut.getFilePointer();
+ }
+
+ try (IndexInput metaIn = dir.openInput("meta", IOContext.READONCE);
+ IndexInput dataIn = dir.openInput("data", IOContext.DEFAULT)) {
+ DirectMonotonicReader.Meta meta =
+ DirectMonotonicReader.loadMeta(metaIn, numValues, blockShift);
Review Comment:
Can you assert that the whole meta file has been read after this call?
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