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java-topology/defects/doris
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russell@unturf.com 72c98d9af6 netty-0001 + dubbo-0002 + doris-0004: DNS dedup O(R²); MethodWalker O(2^D); NormalizeRepeat O(S×G); count 621→624 
- netty-0001: DnsResolveContext.finalResult ArrayList.contains O(R²) dedup on DNS records
  File: resolver-dns/.../dns/DnsResolveContext.java line ~914
  Fix: LinkedHashSet gives O(1) dedup with preserved insertion order
  Ratio: 24.5x at R=50 records

- dubbo-0002: MethodWalker.walkHierarchy no visited guard — O(2^D) diamond recursion
  File: dubbo-rpc-triple/.../rest/util/MethodWalker.java walkHierarchy()
  Fix: add visited HashSet, return early if already visited
  Ratio: 8x at D=3 (common Spring proxy depth)

- doris-0004: NormalizeRepeat.buildContextWithAlias ImmutableList.contains O(S×G) for GROUPING SETS
  File: fe-core/.../nereids/rules/analysis/NormalizeRepeat.java buildContextWithAlias()
  Fix: convert groupingSetExpressions to HashSet before loop — O(1) lookup
  Ratio: 49x for CUBE(c1..c8), 1000x+ for CUBE(c1..c10)
2026-03-29 22:11:57 -04:00
..
patch netty-0001 + dubbo-0002 + doris-0004: DNS dedup O(R²); MethodWalker O(2^D); NormalizeRepeat O(S×G); count 621→624 2026-03-29 22:11:57 -04:00
unit netty-0001 + dubbo-0002 + doris-0004: DNS dedup O(R²); MethodWalker O(2^D); NormalizeRepeat O(S×G); count 621→624 2026-03-29 22:11:57 -04:00