Support late materialization
Open
@Lloyd-Pottiger is already working on this.
Since Oct 14, 2022.
component/storage
type/feature-request
type/performance
- Dominant language
- C++
- Stars
- 1k
- Forks
- 423
- Avg merge
- 1d 15h
- Merged PRs (30d)
- 24
Description
Feature Request
Is your feature request related to a problem? Please describe:
For some query like select * from t where a + b <> 0;, we now scan all columns and then do filter, which is heavy and we can do better.
Describe the feature you'd like:
Support late materialization. We can scan column(s) at first to filter out unnecessary data segment, and then just scan the rest columns.
Describe alternatives you've considered:
Teachability, Documentation, Adoption, Migration Strategy:
Subtask:
- support late materialization in Selection
- support late materialization in fast scan
- support late materialization in disaggregated TiFlash
- better scan context after some filter conditions pushed down
- (optional) support push down TopN
- (optional) support late materialization in Join
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