mz_expr::linear::util

Struct KeyValRowMapping

Source 
struct KeyValRowMapping {
    to_key: Vec<MirScalarExpr>,
    to_val: Vec<usize>,
    to_row: Vec<usize>,
}
Expand description

A triple of actions that map from rows to (key, val) pairs and back again.

Fields§

§to_key: Vec<MirScalarExpr>

Expressions to apply to a row to produce key datums.

§to_val: Vec<usize>

Columns to project from a row to produce residual value datums.

§to_row: Vec<usize>

Columns to project from the concatenation of key and value to reconstruct the row.

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