Function isNumericValue

buffer.go:619–670

isNumericValue checks if a string represents a valid number Handles: integers, floats, scientific notation, negative numbers

(s string)

// isNumericValue checks if a string represents a valid number
// Handles: integers, floats, scientific notation, negative numbers
func isNumericValue(s string) bool {
	if len(s) == 0 {
		return false
	}

	// Quick check for common patterns
	hasDigit := false
	hasDot := false
	hasE := false
	i := 0

	// Handle sign
	if s[i] == '+' || s[i] == '-' {
		i++
		if i >= len(s) {
			return false
		}
	}

	// Parse number
	for i < len(s) {
		c := s[i]

		if c >= '0' && c <= '9' {
			hasDigit = true
		} else if c == '.' {
			if hasDot || hasE {
				return false // Multiple dots or dot after E
			}
			hasDot = true
		} else if c == 'e' || c == 'E' {
			if !hasDigit || hasE {
				return false // E without digits or multiple E
			}
			hasE = true
			hasDigit = false // Reset for exponent part

			// Check for sign after E
			if i+1 < len(s) && (s[i+1] == '+' || s[i+1] == '-') {
				i++
			}
		} else if c == '_' || c == ',' {
			// Allow thousand separators (common in data files)
			// Skip validation, just continue
		} else {
			return false // Invalid character
		}
		i++
	}

	return hasDigit
}

// detectAllColumnTypes automatically detects types for all columns in parallel
func (b *Buffer) detectAllColumnTypes() {