fix: close remaining sharding correctness holes - #59
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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.
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Summary
Stacked on #58.
COUNT(*)/ other aggs to aggregate-output columns.JOINSQL.DistributedTransactionManager; in-txn SELECTs use pinned sessions.sqlengine --txn-log PATHoptional.Validation
./run_tests --gtest_brief=1: 1320 passed, 38 skipped./run_tests --gtest_filter='PlanExecutorTest.Having*:DistributedPlannerTest.Having*:DistributedPlannerTest.Colocated*:DistributedDmlTest.MultiTable*'sqlengine.cppandmysql_server.cppcompile