imay commented on issue #831: Powerful Improve: parallel scan exec instance URL: https://github.com/apache/incubator-doris/issues/831#issuecomment-477607940 @kangkaisen Wonderful job!!! It is very useful for single query's performance. However this is bad for broadcast join, because inner table will be sent more times, and more memory would be taken. So I think adding a new config to limit max instances is acceptable. And now Doris's query optimizer can't decide when to use broadcast join or shuffle join, we should improve our optimizer. And our optimizer should decide how many scan instances should be allocated according to its data size. Then we can drop this config item. Looking forward to your PR
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