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collapse_lex_req in datafusion::physical_expr::equivalence - Rust
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Function datafusion::physical_expr::equivalence::collapse_lex_req

source · 
pub fn collapse_lex_req(
    input: Vec<PhysicalSortRequirement>
) -> Vec<PhysicalSortRequirement>
Expand description

This function constructs a duplicate-free LexOrderingReq by filtering out duplicate entries that have same physical expression inside. For example, vec![a Some(Asc), a Some(Desc)] collapses to vec![a Some(Asc)].