5a5a929b9e
`DeletePredicate` is a simpler version of `Predicate` that is based on IOx `DeleteExpr` instead of the full-blown DataFusion `Expr`. This will allow us to do a couple of things (in follow-up changes): - Order and de-duplicate delete predicates - Normalize predicates - Infallible serialization - Smaller memory footprint Note that this change only affects delete expressions. Query expressions that are supported via the API are not changed. The query subsystem also still uses the full-featured expressions/predicates (delete expressions/predicates are converted to the more powerful DataFusion version on-the-fly). |
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| Cargo.toml | ||
| README.md | ||
README.md
IOx Query Layer
The IOx query layer is responsible for translating query requests from different query languages and planning and executing them against Chunks stored across various IOx storage systems.
Query Frontends
- SQL
- Storage gRPC
- Flux (possibly in the future)
- InfluxQL (possibly in the future)
- Others (possibly in the future)
Sources of Chunk data
- ReadBuffer
- MutableBuffer
- Parquet Files
- Others (possibly in the future, like Remote Chunk?)
The goal is to use the shared query / plan representation in order to avoid N*M combinations of language and Chunk source.
Thus query planning is implemented in terms of traits, and those traits are implemented by different chunk implementations.
Among other things, this means that this crate should not depend directly on the ReadBuffer or the MutableBuffer.
┌───────────────┐ ┌────────────────┐ ┌──────────────┐ ┌──────────────┐
│Mutable Buffer │ │ Read Buffer │ │Parquet Files │ ... │Future Source │
│ │ │ │ │ │ │ │
└───────────────┘ └────────────────┘ └──────────────┘ └──────────────┘
▲ ▲ ▲ ▲
└───────────────────┴─────────┬──────────┴─────────────────────┘
│
│
┌─────────────────────────────────┐
│ Shared Common │
│ Predicate, Plans, Execution │
└─────────────────────────────────┘
▲
│
│
┌──────────────────────┼─────────────────────────┐
│ │ │
│ │ │
│ │ │
┌───────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│ SQL Frontend │ │ gRPC Storage │ ... │ Future Frontend │
│ │ │ Frontend │ │ (e.g. InfluxQL) │
└───────────────────┘ └──────────────────┘ └──────────────────┘
We are trying to avoid ending up with something like this:
┌─────────────────────────────────────────────────┐
│ │
▼ │
┌────────────┐ │
│Read Buffer │ ┌────────────────────────┤
┌──────────┼────────────┼─────┬────────────┼────────────────────────┤
│ └────────────┘ │ ▼ │
▼ ▲ │ ┌──────────────┐ │
┌───────────────┐ │ │ │Parquet Files │ │
│Mutable Buffer │ │ ├───▶│ │... │
│ │◀────────┼───────────┤ └──────────────┘ ┌─────────────┼┐
└───────────────┘ │ │ ▲ │Future Source││
▲ │ ├────────────┼─────────▶│ ││◀─┐
│ │ │ │ └─────────────┼┘ │
│ │ │ │ │ │
│ │ │ │ │ │
│ ┌──────────┘ │ │ │ │
│ │ │ │ │ │
│ ├──────────────────────┼────────────┘ │ │
└──────┤ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
┌───────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │ │
│ SQL Frontend │ │ gRPC Storage │ ... │ Future Frontend │ │ │
│ │ │ Frontend │ │ (e.g. InfluxQL) │──┴───┘
└───────────────────┘ └──────────────────┘ └──────────────────┘