I have noticed that certain (complex) select queries return unexpected data 
(missing rows) on my upgraded SQLite databases.My guess is that the optimizer 
makes an erroneous decision on some index (I'm using both sqlite_stat1 and 
sqlite_stat2). Is this a reasonable guess? Is it necessary to run the ANALYZE 
command after upgrading (altering table columns etc) a database? Thanks!        
                               
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