org.apache.flink.table.expressions

Interface ExpressionVisitor<R>

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

Modifier and Type	Method and 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)