Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps¶
std::cell::OnceCell is a partial implementation of
once_cellin the Rust standard library.There are 2 Rust crates lazy_static and once_cell for (lazy) once assignment (which can be used to create singletons). once_cell
Define Variables in Rust
Filter a Polars DataFrame in Rust
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps¶
LazyFrame.filterfilters rows using anExprwhileDataFrame.filterfilters rows using a mask of the typeChunkedArray<BooleanType>.
Filter a Polars LazyFrame in Rust
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps¶
LazyFrame.filterfilters rows using anExprwhileDataFrame.filterfilters rows using a mask of the typeChunkedArray<BooleanType>.
Hands on the Rust Crate Parquet
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Comments¶
- Notice that a cell in a Parquet table has a type of
Fieldwhich is an enum of types.