RexProgram.Checker (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rex.RexVisitorImpl<java.lang.Boolean>
- - org.apache.calcite.rex.RexChecker
  - - org.apache.calcite.rex.RexProgram.Checker

All Implemented Interfaces:

RexVisitor<java.lang.Boolean>

Enclosing class:

RexProgram
```
static class RexProgram.Checker
extends RexChecker
```
Visitor which walks over a program and checks validity.

Field Summary

Fields
Modifier and Type Field Description

private java.util.List<RelDataType> internalExprTypeList
- Fields inherited from class org.apache.calcite.rex.RexChecker
  context, failCount, inputTypeList, litmus
- Fields inherited from class org.apache.calcite.rex.RexVisitorImpl
  deep

Constructor Summary

Constructors
Constructor	Description
`Checker(RelDataType inputRowType, java.util.List<RelDataType> internalExprTypeList, RelNode.Context context, Litmus litmus)`	Creates a Checker.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.Boolean`	`visitLocalRef(RexLocalRef localRef)`	Overrides `RexChecker` method, because `RexLocalRef` is is illegal in most rex expressions, but legal in a program.

Methods inherited from class org.apache.calcite.rex.RexChecker
getFailureCount, isValid, visitCall, visitCorrelVariable, visitFieldAccess, visitInputRef

Methods inherited from class org.apache.calcite.rex.RexVisitorImpl
visitArrayAnd, visitArrayOr, visitDynamicParam, visitLiteral, visitOver, visitPatternFieldRef, visitRangeRef, visitSubQuery, visitTableInputRef

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - internalExprTypeList
```
private final java.util.List<RelDataType> internalExprTypeList
```
- Constructor Detail
  - Checker
```
Checker(RelDataType inputRowType,
        java.util.List<RelDataType> internalExprTypeList,
        RelNode.Context context,
        Litmus litmus)
```
    Creates a Checker.
    
    Parameters:
    
    inputRowType - Types of the input fields
    
    internalExprTypeList - Types of the internal expressions
    
    context - Context of the enclosing RelNode, or null
    
    litmus - Whether to fail
- Method Detail
  - visitLocalRef
```
public java.lang.Boolean visitLocalRef(RexLocalRef localRef)
```
    Overrides RexChecker method, because RexLocalRef is is illegal in most rex expressions, but legal in a program.
    
    Specified by:
    
    visitLocalRef in interface RexVisitor<java.lang.Boolean>
    
    Overrides:
    
    visitLocalRef in class RexChecker