Fix core issue of 4447 and change declare order for compatibility

[HappenLee]

1. Fix core bug wild pointer in PlanFragmentExecutor, Fix [Bug] Core problem in query mysql external table if compile BE code disable the complile var WITH_MYSQL #4447
2. Fix core bug wild pointer json load, Fix [Bug] core problem when load json data, when the jsonpaths not inappropriate with table column #4452
3. Change the declare order of ODBC type in thrift for compatibility

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[kangkaisen]

+1

[morningman]

LGTM