Struct ColumnMapping 

pub struct ColumnMapping {
    pub transaction_id: usize,
    pub item_columns: Vec<usize>,
    pub timestamp: usize,
    pub field_separator: String,
}

Column mapping configuration for flexible data loading

Allows you to specify which columns to mine from your data, supporting multiple fields combined into patterns.

Fields

transaction_id: usize

Column index for transaction/group ID (0-based)

item_columns: Vec<usize>

Column indices for items to mine (supports multiple columns)

timestamp: usize

Column index for timestamp (0-based)

field_separator: String

Separator to combine multiple item columns (default: “::”)

Implementations

impl ColumnMapping

pub fn simple( transaction_id: usize, item_column: usize, timestamp: usize, ) -> Self

Create mapping with transaction_id, single item column, and timestamp

Example

use rust_rule_miner::data_loader::ColumnMapping;

// Mine product names from column 1
let mapping = ColumnMapping::simple(0, 1, 5);
// CSV: customer_id, product_name, category, price, location, timestamp
//      0            1             2         3      4         5

pub fn multi_field( transaction_id: usize, item_columns: Vec<usize>, timestamp: usize, field_separator: String, ) -> Self

Create mapping to mine multiple fields combined

Example

use rust_rule_miner::data_loader::ColumnMapping;

// Mine product + category + location combined
let mapping = ColumnMapping::multi_field(
    0,                  // customer_id (column 0)
    vec![1, 2, 4],      // product(1), category(2), location(4)
    5,                  // timestamp (column 5)
    "::".to_string()    // separator
);
// CSV: customer_id, product, category, price, location, timestamp
// Results in items like: "Laptop::Electronics::US"

Trait Implementations

impl Clone for ColumnMapping

fn clone(&self) -> ColumnMapping

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnMapping

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.