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Parents and children of check-in [d17ef7d1]

Increase the version number for the next release - which is still months away but there have been significant query planner enhancements since the previous release. check-in: 457eedfa user: drh tags: trunk
Reactivate query flattening when the result set of the outer query has no function calls or subqueries. This is a partial reversal of check-in [c9104b59]. Co-routines are still preferred if the outer query has a complex result set, but for simple results sets, query flattening is used. Check-in [4464f40ccd7] is completely backed out due to this change. check-in: d17ef7d1 user: drh tags: trunk
Add test cases from OSSFuzz to prevent a regression in co-routine processing. check-in: 689743d8 user: drh tags: trunk
Turn restriction 20 on the query flattener into an assert since the situation restricted can no longer occur because of the more aggressive use of co-routines. check-in: 4464f40c user: drh tags: trunk