Jark wrote > 我看你的作业里面是window agg,目前 window agg 还不支持自动拆分。1.13 的基于 window tvf 的 window > agg支持这个参数了。可以期待下。 > > Best, > Jark > > On Wed, 24 Mar 2021 at 19:29, Robin Zhang <
> vincent2015qdlg@ > > > wrote: > >> Hi,guomuhua >> 开启本地聚合,是不需要自己打散进行二次聚合的哈,建议看看官方的文档介绍。 >> >> Best, >> Robin >> >> >> guomuhua wrote >> > 在SQL中,如果开启了 local-global 参数:set >> > table.optimizer.agg-phase-strategy=TWO_PHASE; >> > 或者开启了Partial-Final 参数:set >> table.optimizer.distinct-agg.split.enabled=true; >> > set >> > table.optimizer.distinct-agg.split.bucket-num=1024; >> > 还需要对应的将SQL改写为两段式吗? >> > 例如: >> > 原SQL: >> > SELECT day, COUNT(DISTINCT buy_id) as cnt FROM T GROUP BY day, >> > >> > 对所需DISTINCT字段buy_id模1024自动打散后,SQL: >> > SELECT day, SUM(cnt) total >> > FROM ( >> > SELECT day, MOD(buy_id, 1024), COUNT(DISTINCT buy_id) as cnt >> > FROM T GROUP BY day, MOD(buy_id, 1024)) >> > GROUP BY day >> > >> > 还是flink会帮我自动改写SQL,我不用关心? >> > >> > 另外,如果只设置开启上述参数,没有改写SQL,感觉没有优化,在flink web ui界面上也没有看到两阶段算子 >> > < >> http://apache-flink.147419.n8.nabble.com/file/t1346/%E7%AE%97%E5%AD%90.png> >> >> > >> > >> > >> > >> > >> > -- >> > Sent from: http://apache-flink.147419.n8.nabble.com/ >> >> >> >> >> >> -- >> Sent from: http://apache-flink.147419.n8.nabble.com/ >> 感谢,如果不是window agg,开启参数后flink会自动打散是吧。那关于window agg, 不能自动打散,这部分的介绍,在文档中可以找到吗?具体在哪里呢?还是需要从源码里找呢?望指教。再次感谢 -- Sent from: http://apache-flink.147419.n8.nabble.com/