samarthjain commented on code in PR #18568:
URL: https://github.com/apache/druid/pull/18568#discussion_r2392381071
##########
processing/src/main/java/org/apache/druid/query/scan/ScanQueryQueryToolChest.java:
##########
@@ -191,6 +198,80 @@ 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)
+ {
+ CacheKeyBuilder builder = new CacheKeyBuilder(SCAN_QUERY)
+ .appendCacheable(query.getVirtualColumns())
+ .appendString(query.getResultFormat().toString())
Review Comment:
Do you know if resultFormat is used after getting results out of the result
set cache or before the results are written to the cache? If former, we
probably can remove it from the cache key.
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