SqlValidatorImpl.NavigationReplacer (Apache Calcite API)

java.lang.Object
- org.apache.calcite.sql.util.SqlBasicVisitor<SqlNode>
- - org.apache.calcite.sql.util.SqlShuttle
  - - org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationModifier
    - - org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationReplacer

All Implemented Interfaces:

SqlVisitor<SqlNode>

Enclosing class:

SqlValidatorImpl
```
private static class SqlValidatorImpl.NavigationReplacer
extends SqlValidatorImpl.NavigationModifier
```
Shuttle that replaces A as A.price > PREV(B.price) with PREV(A.price, 0) > LAST(B.price, 0).
Replacing A.price with PREV(A.price, 0) makes the implementation of RexVisitor.visitPatternFieldRef(RexPatternFieldRef) more unified. Otherwise, it's difficult to implement this method. If it returns the specified field, then the navigation such as PREV(A.price, 1) becomes impossible; if not, then comparisons such as A.price > PREV(A.price, 1) become meaningless.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.calcite.sql.util.SqlShuttle
  SqlShuttle.CallCopyingArgHandler
- Nested classes/interfaces inherited from class org.apache.calcite.sql.util.SqlBasicVisitor
  SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

Fields
Modifier and Type Field Description

private java.lang.String alpha

Constructor Summary

Constructors
Constructor Description

NavigationReplacer(java.lang.String alpha)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`SqlNode`	`visit(SqlCall call)`	Visits a call to a `SqlOperator`.
`SqlNode`	`visit(SqlIdentifier id)`	Visits an identifier.

Methods inherited from class org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationModifier
go

Methods inherited from class org.apache.calcite.sql.util.SqlShuttle
visit, visit, visit, visit, visit

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

- Field Detail
  - alpha
```
private final java.lang.String alpha
```
- Constructor Detail
  - NavigationReplacer
```
NavigationReplacer(java.lang.String alpha)
```
- Method Detail
  - visit
```
public SqlNode visit(SqlCall call)
```
    Description copied from interface: SqlVisitor
    
    Visits a call to a SqlOperator.
    
    Specified by:
    
    visit in interface SqlVisitor<SqlNode>
    
    Overrides:
    
    visit in class SqlShuttle
    
    Parameters:
    
    call - Call
    
    See Also:
    
    SqlCall.accept(SqlVisitor)
  - visit
```
public SqlNode visit(SqlIdentifier id)
```
    Description copied from interface: SqlVisitor
    
    Visits an identifier.
    
    Specified by:
    
    visit in interface SqlVisitor<SqlNode>
    
    Overrides:
    
    visit in class SqlShuttle
    
    Parameters:
    
    id - identifier
    
    See Also:
    
    SqlIdentifier.accept(SqlVisitor)