Multi-stage distributed queries - #106020
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huldarchen
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… fixes ASan heap corruption on master"
huldarchen
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…vert-106020-multistage-distributed Revert "Revert "Multistage distributed queries" (ClickHouse#106020) — fixes ASan heap corruption on master"
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…ted queries) and ClickHouse#107056 The prior CI run executed on a merge-base ~980 commits behind these fixes, so it inherited the master-wide ASan heap corruption from ClickHouse#106020 (segfaults during String serialization in DistributedSink / MergeTask / MergeMutate, STIDs 1288-3bd5, 2046-50c3, 0988-1d81) plus the known-flaky 02865_tcp_proxy_query_packet_validation. Both are fixed on current master. No conflicts; CREATE OR REPLACE size-check changes are unaffected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Backport of ClickHouse#106020: Multi-stage distributed queries
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Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):
Multi-stage distributed query execution: the planner splits the query plan into stages connected by scatter / broadcast / gather / shuffle exchanges and dispatches the plan fragments to worker nodes. The data between stages is streamed via TCP or passed via temporary files in shared object storage, the path supports distributed shuffle and broadcast hash joins, shuffle aggregation, and distributed sort. The feature is experimental and is disabled by default.
Version info
26.6.1.571