dropStreamEngine
Syntax
dropStreamEngine(name)
Alias: dropAggregator
Arguments
name is a string indicating the name of a created stream engine. You can obtain all created engines with function getStreamEngineStat.
Details
Release the definition of a stream engine from the memory.
Examples
share streamTable(1000:0, `time`sym`qty, [TIMESTAMP, SYMBOL, INT]) as trades
outputTable = table(10000:0, `time`sym`sumQty, [TIMESTAMP, SYMBOL, INT])
tradesEngine = createTimeSeriesEngine(name="StreamEngineDemo", windowSize=3, step=3, metrics=<[sum(qty)]>, dummyTable=trades, outputTable=outputTable, timeColumn=`time, useSystemTime=false, keyColumn=`sym, garbageSize=50)
subscribeTable(tableName="trades", actionName="tradesEngine", offset=0, handler=append!{tradesEngine}, msgAsTable=true)
def writeData(n){
timev = 2018.10.08T01:01:01.001 + timestamp(1..n)
symv =take(`A`B, n)
qtyv = take(1, n)
insert into trades values(timev, symv, qtyv)
}
writeData(6);
// output
select * from outputTable;
time | sym | sumQty |
---|---|---|
2018.10.08T01:01:01.003 | A | 1 |
2018.10.08T01:01:01.006 | A | 1 |
2018.10.08T01:01:01.006 | B | 2 |
dropStreamEngine("StreamEngineDemo");