使用createReactiveStateEngine时报错A metric shouldn't be a constant.如何在metrics中传入一个常量

下面的写法报错A metric shouldn't be a constant.，请问怎么可以实现在metrics中传入一个常量

share streamTable(1:0, `date`time`sym`market`price`qty, [DATE, TIME, SYMBOL, CHAR, DOUBLE, INT]) as trade
outputTable = table(100:0, `date`sym`factor1`flag, [DATE, STRING, DOUBLE, INT])
engine = createReactiveStateEngine(name="test", metrics=[<mavg(price, 3)>, <1>], dummyTable=trade, outputTable=outputTable, keyColumn=["date","sym"], filter=<date between 2012.01.01 : 2012.01.03>, keepOrder=true)

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默认排序时间排序

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Yating Xie 2022-04-21 22:05

在metrics中不支持常量，但是可以用下面的办法实现

engine = createReactiveStateEngine(name="test", metrics=[<mavg(price, 3)>, <price-price+1>], dummyTable=trade, outputTable=outputTable, keyColumn=["date","sym"], filter=<date between 2012.01.01 : 2012.01.03>, keepOrder=true)

使用createReactiveStateEngine时报错A metric shouldn't be a constant.如何在metrics中传入一个常量

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