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ReaderFilterPlan

mito2::sst::parquet::prefilter

Struct ReaderFilterPlan 

Source 
pub(crate) struct ReaderFilterPlan {
    pub(crate) remaining_simple_filters: Vec<SimpleFilterContext>,
    pub(crate) prefilter_builder: Option<PrefilterContextBuilder>,
}
Expand description

How the parquet reader should apply each predicate.

The reader runs in two phases. Predicates routed into prefilter_builder execute on a reduced column set first to compute a refined row selection; remaining_simple_filters execute alongside the full projection on the normal read path. The contract for what is precise vs best-effort is documented on build_reader_filter_plan.

Fields§

§remaining_simple_filters: Vec<SimpleFilterContext>

Simple filters that must run on the normal read path: predicates with Matched / Pruned outcomes (which carry expected-metadata compatibility decisions later phases rely on), and predicates whose column cannot be read directly during the prefilter pass.

§prefilter_builder: Option<PrefilterContextBuilder>

Pre-built state for the prefilter pass, or None when prefiltering is not worthwhile (no prefilter columns selected, or the prefilter projection would cover nearly the full read).

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