Function polars_core::toggle_string_cache

source · 
pub fn toggle_string_cache(toggle: bool)
Expand description

Use a global string cache for the Categorical Types.

This is used to cache the string categories locally. This allows join operations on categorical types.

Examples found in repository?
src/chunked_array/logical/categorical/stringcache.rs (line 35)
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    pub fn new() -> IUseStringCache {
        toggle_string_cache(true);
        IUseStringCache { private_zst: () }
    }
}

impl Drop for IUseStringCache {
    fn drop(&mut self) {
        toggle_string_cache(false)
    }
}

pub fn with_string_cache<F: FnOnce() -> T, T>(func: F) -> T {
    toggle_string_cache(true);
    let out = func();
    toggle_string_cache(false);
    out
}