Package org.apache.calcite.rex

Class RexFieldAccess

java.lang.Object
org.apache.calcite.rex.RexNode
org.apache.calcite.rex.RexFieldAccess
public class RexFieldAccess extends org.apache.calcite.rex.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')

FLINK modifications are at lines

  1. Should be removed after fixing CALCITE-6342 (Calcite 1.36.0): Lines 83-87

  • Field Summary

    Fields inherited from class org.apache.calcite.rex.RexNode

    digest

  • Method Summary

    Modifier and Type
    Method
    Description
    <R, P> R
    accept(org.apache.calcite.rex.RexBiVisitor<R,P> visitor, P arg)
     
    <R> R
    accept(org.apache.calcite.rex.RexVisitor<R> visitor)
     
    boolean
    equals(@Nullable Object o)
     
    org.apache.calcite.rel.type.RelDataTypeField
    getField()
     
    org.apache.calcite.sql.SqlKind
    getKind()
     
    org.apache.calcite.rex.RexNode
    getReferenceExpr()
    Returns the expression whose field is being accessed.
    org.apache.calcite.rel.type.RelDataType
    getType()
     
    int
    hashCode()
     

    Methods inherited from class org.apache.calcite.rex.RexNode

    isA, isA, isAlwaysFalse, isAlwaysTrue, nodeCount, toString

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

  • Method Details

    • getField

      public org.apache.calcite.rel.type.RelDataTypeField getField()

    • getType

      public org.apache.calcite.rel.type.RelDataType getType()
      Specified by:
      getType in class org.apache.calcite.rex.RexNode

    • getKind

      public org.apache.calcite.sql.SqlKind getKind()
      Overrides:
      getKind in class org.apache.calcite.rex.RexNode

    • accept

      public <R> R accept(org.apache.calcite.rex.RexVisitor<R> visitor)
      Specified by:
      accept in class org.apache.calcite.rex.RexNode

    • accept

      public <R, P> R accept(org.apache.calcite.rex.RexBiVisitor<R,P> visitor, P arg)
      Specified by:
      accept in class org.apache.calcite.rex.RexNode

    • getReferenceExpr

      public org.apache.calcite.rex.RexNode getReferenceExpr()
      Returns the expression whose field is being accessed.

    • equals

      public boolean equals(@Nullable Object o)
      Specified by:
      equals in class org.apache.calcite.rex.RexNode

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in class org.apache.calcite.rex.RexNode