I am trying to understand the MAL statements for joining three tables . On which I came across bind function in MAL statement . I have a table lineitem with l_quantity in it .  So what does the following statements means


1  )   ( X_94:bat[:oid,:oid] ,X_95:bat[:oid,:int] ) := sql.bind(X_4,"sys","lineitem","l_quantity",2,0,4);

2  )   (X_96:bat[:oid,:oid] ,X_97:bat[:oid,:int] ) := sql.bind(X_4,"sys","lineitem","l_quantity",2,1,4);