kangpinghuang commented on issue #1157: Use inexistent key (in prefix-index) to filter rows will cost too much time to return. URL: https://github.com/apache/incubator-doris/issues/1157#issuecomment-492991757 there two reasons for this problem: 1. there is data skew in your table, The data size and row size of one tablet is 10x larger than other. and I find out that the skewed data is the data with empty cuid. And the slow cuid is in this tablet 2. there is a bug when seek position in the data with the short key of varchar type. This is fixed by pr #1167
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