Comments (1)
alamb
commented on June 18, 2024
Here are some notes I have on what I want to talk about
interfaces and then paradoxically allowed us to narrow the scope of potential optimizations (e.g. compute kernels) and have people focus on different areas.
Things we didn't implement:
- File formats (instead focused on Parquet, avro, arrow, json, csv)
- Memory format Arrow (not just externally but internally)
- threadpool standard (tokio) vs our own thread pool
- pull / exchange rather than morsel driven parallelism
- standard I/O rather than buffer pool
- latest / greatest window aggregates fanciness (todo get paper link)
Providing simple built in defaults, but hooks for more specialized implementations
Keeps DF simple, allows
- Catalog
- memory / disk manager
Things we did: places we spent time and complexity
- normalized keys / row format
- optimizing parquet reader
- optimizing hashing
- plan representation (logical plans, exprs, etc)
- function library
- ListingTable (maybe this should have been more
Things I would do differently next time:
Keep listing table out of the core
UDFs from the start
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Related Issues (20)
- `OuterColumnReference` Expr --> String Support HOT 1
- Add an example of how to use the SQL parser/unparser API HOT 2
- Support Substrait VirtualTables
- Discussion: make it easier for specify SQL --> function translation HOT 3
- Create a DataFusion blog HOT 3
- `analysis.rs` bounds check panic HOT 2
- AggregateUDF expression API design HOT 2
- Example for building an external index for parquet files HOT 6
- `array_slice` can't correctly handle NULL parameters or some edge cases
- Add an example of how to convert LogicalPlan to/from SQL Strings
- Cast from string to date with "/" HOT 2
- error: this arithmetic operation will overflow (on i386)
- REmove workaround for `COUNT(*)` in subquery decorrelation code
- Make SQL strings generated from `Expr`s "prettier" HOT 11
- Dynamic schema for custom TableProvider HOT 3
- ScalarValue serialization does not handle nested dictionary values
- Using `Expr::field` panics HOT 3
- Improve signature of `get_field` is function
- UserDefinedLogicalNode::from_template does not return a Result<...> >
- UserDefindedLogicalNode::from_template does not return a Result<...>. HOT 3
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