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Parents and children of check-in [9a425051]

Limit the size of SrcList objects to 200 entries (compile-time configurable using -DSQLITE_MAX_SRCLIST=n). The maximum number of tables in a join has always been 64, so this is not a real constraint on capability. Limiting the size of a SrcList prevents DOS attacks (discovered by OSSFuzz) using crazy nexted CTE joins. check-in: 7cac614d user: drh tags: trunk
Fix a corner-case for the logic that cause an insert of a NULL into an INTEGER PRIMARY KEY column to be converted into a valid integer key, when the NULL results from a CASE expression that lacks an ELSE clause. check-in: 9a425051 user: drh tags: trunk
Ensure that the variable-length integer decoder in FTS3 never tries to left-shift a negative number. check-in: 10ffc1fe user: drh tags: trunk