fix: distribute derived tables and stop silent sort/SQL bugs - #58
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renecannao merged 3 commits intoAug 19, 2026
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Rewrite DERIVED_SCAN inner plans so FROM (SELECT ...) hits remote shards. Store remote_sql_len as uint32_t so statements longer than 64KB are not truncated. Resolve ORDER BY position/alias in the plan builder, and only MERGE_SORT when every key is a table column — expressions gather and sort locally instead of comparing column 0.
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Refuse multi-table UPDATE/DELETE when any table is sharded or backends differ. Evaluate HAVING against aggregate output so COUNT(*) filters work locally and distributed. Push equi-joins of same-layout sharded tables to each shard. sqlengine and mysql_server use 2PC when backends are configured; SELECTs inside an open distributed txn hit pinned sessions. Optional --txn-log on sqlengine.
fix: close remaining sharding correctness holes
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Summary
Stacked on #57.
FROM (SELECT …):distribute_noderewritesDERIVED_SCAN.inner_plan. Inner scans becomeREMOTE_SCANs.remote_sql_len:uint16_t→uint32_t(matchesStringRef). Test uses a 70k literal.MERGE_SORTkeys:ORDER BYposition/alias rewritten to the select-list expr inPlanBuilder. Expression keys no longer merge on column 0 — they gather and sort locally.Validation
./run_tests --gtest_brief=1: 1315 passed, 38 skipped./run_tests --gtest_filter='DistributedPlannerTest.Derived*:DistributedPlannerTest.OrderBy*:DistributedPlannerTest.RemoteSql*:PlanExecutorTest.OrderBy*'