Compaction bug in 0.12.2

[THUMarkLau]

Under some schema, the cross space compaction will report error when getting schema of timeseries. For example, if we have timeseries like:

root.FJXNY.350112.CJHCG50111AN01RAW00
root.FJXNY.350112.MUUNB00221PA03SUM00
root.FJXNY.350112.CJHCE10221DG01RAW00
root.FJXNY.350112.F11.MUUQE00121PW01RAW00
root.FJXNY.350112.F11.MUUNB00321PA04SUM00
root.FJXNY.350112.F11.MUUNB00121PA02SUM00
root.FJXNY.350112.F11.CJHCS50111SP01AVG06

The cross compaction will report an error like

The reason for this bug is that the program will get the device node root.FJXNY.350112, then visit all his children, and save his children as MeasurementNode. But a child root.FJXNY.350112.F11 of root.FJXNY.350112 is not a MeasurementNode, but a DeviceNode, so an error will be reported.

[jun0315]

Maybe you can take a look at this issue: https://issues.apache.org/jira/browse/IOTDB-1690 , the reason may be similar, PR: #3971

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