Struct polars_plan::logical_plan::FileCacher

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pub struct FileCacher { /* private fields */ }
Available on crate features ipc or parquet or csv or cse or json only.
Expand description

Aggregate all the columns used in csv scans and make sure that all columns are scanned in one go. Due to self joins there can be multiple Scans of the same file in a LP. We already cache the scans in the PhysicalPlan, but we need to make sure that the first scan has all the columns needed.

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