(improvement)Optimize DCAware/RackAware/TokenAware/HostFilter policies with host distance caching and overall perf. improvements#651

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mykaul wants to merge 7 commits intoscylladb:masterfrom

mykaul:query_plan_opt_2

Commits on Apr 3, 2026

perf: optimize DCAwareRoundRobinPolicy with cached remote hosts
mykaul
committed
feat: add make_query_plan_with_exclusion to LoadBalancingPolicy, RoundRobin, and DCAware
mykaul
committed
perf: optimize RackAwareRoundRobinPolicy with cached host distances
mykaul
committed
feat: add make_query_plan_with_exclusion to RackAwareRoundRobinPolicy
mykaul
committed
perf: add LRU replica cache and optimize TokenAwarePolicy query plan
mykaul
committed
feat: add make_query_plan_with_exclusion to HostFilterPolicy and DefaultLoadBalancingPolicy
mykaul
committed
test: add unit tests for query plan exclusion, LRU cache, and LWT determinism
mykaul
committed