用table1.factor 这样的写法
share streamTable(1:0, `time`sym`factor, [TIMESTAMP, SYMBOL, DOUBLE]) as table1 share streamTable(1:0, `time`sym`factor, [TIMESTAMP, SYMBOL, DOUBLE]) as table2 prevailingQuotes=table(100:0, `time`sym`factor1`factor2, [TIMESTAMP, SYMBOL, DOUBLE, DOUBLE]) ajEngine=createAsofJoinEngine(name="aj1", leftTable=table1, rightTable=table2, outputTable=prevailingQuotes, metrics=<[table1.factor, table2.factor]>, matchingColumn=`sym, timeColumn=`time, useSystemTime=false, delayedTime=1)