Method sortByDate

buffer.go:339–375

sortByDate sorts column by date format with optimized date parsing

(colIndex int, rev bool)

// sortByDate sorts column by date format with optimized date parsing
func (b *Buffer) sortByDate(colIndex int, rev bool) {
	hasHeader := I2B(b.rowFreeze)
	dataRows := b.cont
	if hasHeader {
		dataRows = b.cont[1:]
	}

	// Create index-value pairs to sort
	type dateRow struct {
		row  []string
		date int64
	}

	pairs := make([]dateRow, len(dataRows))
	for i := range dataRows {
		pairs[i] = dateRow{
			row:  dataRows[i],
			date: parseDateValueFast(dataRows[i][colIndex]),
		}
	}

	// Sort the pairs
	if rev {
		sort.SliceStable(pairs, func(i, j int) bool {
			return pairs[i].date > pairs[j].date
		})
	} else {
		sort.SliceStable(pairs, func(i, j int) bool {
			return pairs[i].date < pairs[j].date
		})
	}

	// Copy back sorted rows
	for i := range pairs {
		dataRows[i] = pairs[i].row
	}
}

// parseNumericValueFast quickly parses a string to float64
// Handles commas, underscores, and returns 0 for invalid values