Function compare_column_values

nodedb/src/engine/timeseries/projection.rs:74–83

Compare two rows by a single column's values.

(col: &ColumnData, a: usize, b: usize)

/// Compare two rows by a single column's values.
fn compare_column_values(col: &ColumnData, a: usize, b: usize) -> std::cmp::Ordering {
    match col {
        ColumnData::Timestamp(v) => v[a].cmp(&v[b]),
        ColumnData::Float64(v) => v[a].partial_cmp(&v[b]).unwrap_or(std::cmp::Ordering::Equal),
        ColumnData::Int64(v) => v[a].cmp(&v[b]),
        ColumnData::Symbol(v) => v[a].cmp(&v[b]),
        // Compare dict-encoded rows by their string IDs (lexicographic by ID, not string value).
        ColumnData::DictEncoded { ids, .. } => ids[a].cmp(&ids[b]),
    }
}

/// Check if a query should use a tag-first projection.
///