GetFieldsFromExpression method
	
	Retrives any fields from an expression.
	
	
	
	Parameters
	
		
			| Name | Description | Mandatory | Type | 
		
		
			| qExpr | Expression to get fields from. | Yes | String | 
		
	
Returns
	
		
			| Name | Description | Type | 
		
		
			| qFieldNames | A list of fields found in the expression. | Array of String |