Package org.apache.calcite.rex

Class RexFieldAccess

java.lang.Object
org.apache.calcite.rex.RexNode
org.apache.calcite.rex.RexFieldAccess
public class RexFieldAccess extends RexNode
Access to a field of a row-expression.

You might expect to use a RexFieldAccess to access columns of relational tables, for example, the expression emp.empno in the query 

SELECT emp.empno FROM emp

but there is a specialized expression RexInputRef for this purpose. So in practice, RexFieldAccess is usually used to access fields of correlating variables, for example the expression emp.deptno in 

SELECT ename
 FROM dept
 WHERE EXISTS (
     SELECT NULL
     FROM emp
     WHERE emp.deptno = dept.deptno
     AND gender = 'F')