datafusion-contrib / datafusion-contrib/liquid-cache
[Epic] Support Variant
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@XiangpengHao is already working on this.
Since Nov 9, 2025.
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- Rust
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Description
Related to #393
Similar to DateTime, variant is also a type of data that most queries only need a subset of it. It will probably be the most important data type for foreseeable future.
We'd like to support variant in LiquidCache.
This means:
- We need to support
Struct, right now LiquidCache cache only cache leaf columns. Variant is basically a logical type over Struct of Binaries. - We need to make our linage analysis aware of the variant use and pushdown that information to liquid cache.
- We need to design a way to automatically shred the variant and only cache the shredded data.
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