源代码如下：
create schema
BarDataEvent(
               timestamp Date,
               openPrice BigDecimal, highPrice BigDecimal, lowPrice BigDecimal, closePrice BigDecimal, volume double
             );
  
insert into BarDataEvent
select
  Tick.lastDateTime as timestamp,
  first(last) as openPrice,
  max(last) as highPrice,
  min(last) as lowPrice,
  last(last) as closePrice, sum(vol) as tradingVolume
from Tick.win:time_batch(1 min)
  
报错：
Error starting statement: Nestable map type configuration encountered an unexpected property type name 'BigDecimal' for property 'lowPrice', expected java.lang.Class or java.util.Map or the name of a previously-declared Map type  
  
不熟悉epl和esper，有方家请指教
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FROM 36.7.131.*