tkalkirill commented on code in PR #1407:
URL: https://github.com/apache/ignite-3/pull/1407#discussion_r1044177646
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modules/page-memory/src/main/java/org/apache/ignite/internal/pagememory/tree/BplusTree.java:
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@@ -6222,6 +6250,72 @@ public void close() {
}
}
+ /**
+ * Class for getting the next row.
+ */
+ private final class GetNext extends Get {
+ @Nullable
+ private T nextRow;
+
+ private GetNext(L row, boolean includeRow) {
+ super(row, false);
+
+ shift = includeRow ? -1 : 1;
+ }
+
+ @Override
+ boolean found(BplusIo<L> io, long pageAddr, int idx, int lvl) {
+ // Must never be called because we always have a shift.
+ throw new IllegalStateException();
+ }
+
+ @Override
+ boolean notFound(BplusIo<L> io, long pageAddr, int idx, int lvl)
throws IgniteInternalCheckedException {
+ if (lvl != 0) {
+ return false;
+ }
+
+ int cnt = io.getCount(pageAddr);
+
+ if (cnt == 0) {
+ // Empty tree.
+ assert io.getForward(pageAddr, partId) == 0L;
+ } else {
+ assert io.isLeaf() : io;
+ assert cnt > 0 : cnt;
+ assert idx >= 0 || idx == -1 : idx;
+ assert cnt >= idx : "cnt=" + cnt + ", idx=" + idx;
+
+ checkDestroyed();
+
+ if (idx == -1) {
+ idx = findNextRowIdx(pageAddr, io, cnt);
+ }
+
+ if (cnt - idx > 0) {
+ nextRow = getRow(io, pageAddr, idx);
+ }
+ }
+
+ return true;
+ }
+
+ int findNextRowIdx(long pageAddr, BplusIo<L> io, int cnt) throws
IgniteInternalCheckedException {
+ // Compare with the first row on the page.
+ int cmp = compare(0, io, pageAddr, 0, row);
Review Comment:
We will never get into this code because the `idx` is always >=0, I deleted
this code.
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