在这个问题上撕掉我的头发：
使用代码中的一个“where”参数执行简单请求。
let request = NSFetchRequest<NSFetchRequestResult>(entityName: FPEstServiceGroupData.entityName)
request.predicate = NSPredicate(format: "jobID == \(jobID)")
let list = try? moc.fetch(request)
获取0条记录：
CoreData: sql: SELECT 0, t0.Z_PK, t0.Z_OPT, t0.ZJOBID, t0.ZNAME, t0.ZSERVICEGROUPID, t0.ZSORTORDER, t0.ZJOB FROM ZFPESTSERVICEGROUPDATA t0 WHERE t0.ZJOBID = ?
CoreData: details: SQLite bind[0] = 59
CoreData: annotation: sql connection fetch time: 0.0003s
CoreData: annotation: fetch using NSSQLiteStatement <0x60400028fc30> on entity 'FPEstServiceGroupData' with sql text 'SELECT 0, t0.Z_PK, t0.Z_OPT, t0.ZJOBID, t0.ZNAME, t0.ZSERVICEGROUPID, t0.ZSORTORDER, t0.ZJOB FROM ZFPESTSERVICEGROUPDATA t0 WHERE t0.ZJOBID = ? ' returned 0 rows with values: (
)
CoreData: annotation: total fetch execution time: 0.0004s for 0 rows.
同时，将CoreData mySQL文件放在磁盘上，执行相同的请求 - 返回数据：
echo "SELECT 0, t0.Z_PK, t0.Z_OPT, t0.ZJOBID, t0.ZNAME, t0.ZSERVICEGROUPID, t0.ZSORTORDER, t0.ZJOB FROM ZFPESTSERVICEGROUPDATA t0 WHERE t0.ZJOBID = 59;" | sqlite3 FPData.sqlite
0|43|2|59|Design and Production|255|3|
0|44|2|59|Specification and Concept|254|2|
0|45|2|59|Web Design|256|3|
怎么可能？