[Bug] Csv import meet error "There are too many timeseries in memory"

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

1.0.0

### Describe the bug and provide the minimal reproduce step

Meet this error when import data to iotdb(version: 1.0.0):
"Meet error when insert csv because 507: There are too many timeseries in memory, please increase MAX_HEAP_SIZE in datanode-env.sh/bat, restart and create timeseries again."

Are there any other options or configurations to avoid this as for now i can`t increase memory size of the server? I don't understand why there are so many timeseries in memory, as there are no queries at the moment. If these timeseries in memory are cache of imported data, when will the memory will be released?

### What did you expect to see?

-

### What did you see instead?

-

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Beginne damit, den CSV-Importfehler in IoTDB 1.0.0 zu reproduzieren, und untersuche das in datanode-env.sh/bat referenzierte timeseries-memory-Limit. Ermittle, warum der Import das Limit ohne Abfragen erreicht und ob Speicher freigegeben wird; abgeschlossen ist die Aufgabe, wenn die Ursache sowie eine unterstützte Konfiguration oder ein Workaround für Server dokumentiert sind, deren Heap-Größe nicht erhöht werden kann.

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