ExpressionVisitor (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

ApiExpressionDefaultVisitor, ApiExpressionVisitor, DeclarativeExpressionResolver, ExpressionConverter, ExpressionDefaultVisitor, LookupCallResolver, ResolvedExpressionDefaultVisitor, ResolvedExpressionVisitor, SqlAggFunctionVisitor
```
@PublicEvolving
public interface ExpressionVisitor<R>
```
The visitor definition of Expression.
An expression visitor transforms an expression to instances of R.
Please note that only ResolvedExpressions are listed here. Pure API expression are handled in visit(Expression).

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`R`	`visit(CallExpression call)`
`R`	`visit(Expression other)`
`R`	`visit(FieldReferenceExpression fieldReference)`
`default R`	`visit(NestedFieldReferenceExpression nestedFieldReference)`
`R`	`visit(TypeLiteralExpression typeLiteral)`
`R`	`visit(ValueLiteralExpression valueLiteral)`

Method Detail

visit
```
R visit(CallExpression call)
```

visit

R visit(ValueLiteralExpression valueLiteral)

visit

R visit(FieldReferenceExpression fieldReference)

visit

R visit(TypeLiteralExpression typeLiteral)

visit
```
R visit(Expression other)
```

visit

default R visit(NestedFieldReferenceExpression nestedFieldReference)