我有一个csv文件，其中工夫列前面多一个字符Z，样本数据如下所示：
code,ts,close,volumeTXFL9,2019.12.17T01:54:01.001123321Z,12001,1TXO12400A0,2019.12.17T01:54:01.867000123Z,30,10UDFL9,2019.12.17T01:54:04.381321124Z,28313,1...当初我想用下列代码导入数据到DolphinDB database分布式表中，可是没胜利：
dbName = "dfs://db1"path = "d:/ticks.csv"if(existsDatabase(dbName)){ dropDatabase(dbName)}db = database(dbName,VALUE,2019.09.04..2020.10.09)modaltb = table(1:0, `code`timestamp`close`volume,[SYMBOL,TIMESTAMP,DOUBLE,DOUBLE])db.createPartitionedTable(modaltb, `trade,`timestamp)schemaTb=extractTextSchema(path)update schemaTb set type=`NANOTIMESTAMP where name=`ts ;loadTextEx(dbHandle=db,tableName='trade', partitionColumns='timestamp',filename=path,schema=schemaTb)求教一下该怎么实现？