Kould

Is there a more detailed description or issue to facilitate participation and contribution? I am very interested in this issue

> There are some steps > > * implement a detacher to get index ranges to scan from filters. Here is an [example](https://github.com/pingcap/tidb/blob/2c46b8e0041822cb638b97b23a9399b27bc8b6b0/pkg/util/ranger/detacher.go#L863-L879) that we can follow > * support...

Recently I read some articles about index selection, and I found a rule: > Use combined indexes when querying with multiple conditions. Note that columns with equivalent conditions need to...

> > So I'm wondering if I can use something like TimeRangePredicateBuilder to sequentially obtain the relevant columns in the composite index, and only when the previous one is of...

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Thank you very much for your suggestion. In fact, according to the current code implementation, Local IO may be more suitable. In fact, this reader was originally scheduled to use...

Since using will generate column with the same name, only the column that are used once should be returned at this time, and the returned column should be selected from...

> It seems that IndexScan will not be used, because the the calculated cost is `None`(`StatisticsMeta` file is not found, only `Analyze` can generate these files, but `Analyze` may have...

Tips: `IndexScan` only makes sense based on large amounts of data. if not, there is not much difference with `SeqScan`. At the same time, Index data is arranged in ascending...

It seems that there is something wrong with `HashJoin`, I'm debugging now, I'll merge this first