appendForJoin

New in version 1.30.10.

语法

appendForJoin(engine, isLeftTable, data)

参数

engine 是流数据 join 引擎，即 createAsofJoinEngine 等函数返回的抽象表对象。目前支持以下 join 引擎:

• createAsofJoinEngine

• createEquiJoinEngine

• createLookupJoinEngine

• createWindowJoinEngine

• createLeftSemiJoinEngine

isLeftTable 布尔类型，插入左表还是右表。

data 将要插入表中的数据。

详情

将数据插入流数据 join 引擎中。

请注意，使用订阅函数(subscribeTable) 为流数据 join 引擎订阅数据时，handler 参数需要为 appendForJoin、getLeftStream 或 getRightStream 函数。

例子

$ leftTable=table(1:0, `timestamp`sym`price, [TIMESTAMP, SYMBOL, DOUBLE])
$ rightTable=table(1:0, `timestamp`sym`val, [TIMESTAMP, SYMBOL, DOUBLE])
$ output=table(100:0, `timestamp`sym`price`val`total, [TIMESTAMP, SYMBOL, DOUBLE, DOUBLE, DOUBLE])
$ ajEngine=createAsofJoinEngine("test1", leftTable, rightTable, output, <[price, val, price*val]>, `sym, `timestamp, false, 7)

$ tmp1=table(take(2012.01.01T00:00:00.000+[1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 20) as timestamp, take(`AAPL, 10) join take(`IBM, 10) as sym, double(1..20) as price)
$ tmp2=table(take(2012.01.01T00:00:00.000+[1, 2, 3, 4, 4, 4, 4, 4, 4, 4], 20) as timestamp, take(`AAPL, 10) join take(`IBM, 10) as sym, double(1..20) as val)

$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.001))
$ appendForJoin(ajEngine, false, (select * from tmp2 where timestamp=2012.01.01T00:00:00.001))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.002))
$ appendForJoin(ajEngine, false, (select * from tmp2 where timestamp=2012.01.01T00:00:00.002))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.003))
$ appendForJoin(ajEngine, false, (select * from tmp2 where timestamp=2012.01.01T00:00:00.003))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.004))
$ appendForJoin(ajEngine, false, (select * from tmp2 where timestamp=2012.01.01T00:00:00.004))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.005))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.006))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.007))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.008))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.009))
$ appendForJoin(ajEngine, true, (select * from tmp1 where timestamp=2012.01.01T00:00:00.010))

$ sleep(5000)