jtuglu1 commented on code in PR #18568:
URL: https://github.com/apache/druid/pull/18568#discussion_r2395984909
##########
processing/src/main/java/org/apache/druid/query/scan/ScanQueryQueryToolChest.java:
##########
@@ -191,6 +198,76 @@ public Sequence<Object[]> resultsAsArrays(final ScanQuery
query, final Sequence<
);
}
+ @Override
+ public CacheStrategy<ScanResultValue, ScanResultValue, ScanQuery>
getCacheStrategy(
+ final ScanQuery query,
+ @Nullable final ObjectMapper objectMapper
+ )
+ {
+ return new CacheStrategy<>()
+ {
+ @Override
+ public boolean isCacheable(ScanQuery query, boolean willMergeRunners,
boolean segmentLevel)
+ {
+ // Currently, there is no bijective mapping from ScanResultValue to
Result<BySegmentResultValueClass<ScanResultValue>>.
+ // This means queries will fail if:
+ // - A query is issued with bySegment:true
+ // - Segment-level cache is enabled on the broker (in which case it
sends bySegment queries to data nodes).
+ return !query.context().isBySegment() && (!segmentLevel ||
willMergeRunners);
+ }
+
+ @Override
+ public byte[] computeCacheKey(ScanQuery query)
Review Comment:
See my comment above. Samarth asked the same question.
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