def _transform_local_field_to_expression(expression, node, context):
    """Transform a LocalField compiler expression into its SQLAlchemy expression representation.

    Args:
        expression: expression, LocalField compiler expression.
        node: SqlNode, the SqlNode the expression applies to.
        context: CompilationContext, global compilation state and metadata.

    Returns:
        Expression, SQLAlchemy expression.
    """
    column_name = expression.field_name
    column = sql_context_helpers.get_column(column_name, node, context)
    return column