pranavshenoy commented on code in PR #4909:
URL: https://github.com/apache/cassandra/pull/4909#discussion_r3584340314
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src/java/org/apache/cassandra/index/sai/memory/TrieMemoryIndex.java:
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@@ -360,6 +368,50 @@ private KeyRangeIterator rangeMatch(Expression expression,
AbstractBounds<Partit
return new InMemoryKeyRangeIterator(cd.mergedKeys.peek(),
cd.maximumKey, cd.mergedKeys);
}
+ /**
+ * Matches all rows whose indexed term starts with the expression's value,
by scanning the trie over the range
+ * {@code [prefix, prefixSuccessor)}. The lower bound is inclusive so a
term equal to the prefix is matched too.
+ */
+ private KeyRangeIterator prefixMatch(Expression expression,
AbstractBounds<PartitionPosition> keyRange)
+ {
+ ByteBuffer prefixBuffer = expression.lower().value.encoded;
+ ByteComparable lowerBound = asComparableBytes(prefixBuffer);
+ ByteBuffer successor = prefixSuccessor(prefixBuffer);
Review Comment:
This is only for in-memory search
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