rzo1 opened a new pull request, #271:
URL: https://github.com/apache/openjpa/pull/271

   https://issues.apache.org/jira/browse/OPENJPA-3034
   
   - Derby and SQL Server use native sequences instead of the sequence table 
fallback (safe when an existing sequence's increment differs from 
allocationSize).
   - Deletes are ordered by logical foreign keys too (FKs known only from the 
mapping).
   - Timestamp versions are bound at the precision of the column, so the 
version check matches what the database stored (DATETIME, TIMESTAMP(0), 
secondPrecision).
   
   TCK: fixes sequenceGeneratorTest (Derby, SQL Server), the @Version timestamp 
tests (MySQL, MariaDB, SQL Server) and the manyXone cascade/persist tests 
(Derby, SQL Server).


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