QueryOperation (Flink : Table : API Java 2.1.0 API)

All Superinterfaces:

Operation

All Known Implementing Classes:

AggregateQueryOperation, CorrelatedFunctionQueryOperation, DistinctQueryOperation, FilterQueryOperation, FunctionQueryOperation, JoinQueryOperation, PartitionQueryOperation, ProjectQueryOperation, SetQueryOperation, SortQueryOperation, SourceQueryOperation, TableSourceQueryOperation, ValuesQueryOperation, WindowAggregateQueryOperation
```
@PublicEvolving
public interface QueryOperation
extends Operation
```
Base class for representing an operation structure behind a user-facing Table API.
It represents an operation that can be a node of a relational query. It has a schema, that can be used to validate a QueryOperation applied on top of this one.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default <T> T`	`accept(QueryOperationVisitor<T> visitor)`
`default String`	`asSerializableString()`	Returns a SQL string that fully serializes this instance.
`default String`	`asSerializableString(org.apache.flink.table.expressions.SqlFactory sqlFactory)`	Returns a SQL string that fully serializes this instance.
`List<QueryOperation>`	`getChildren()`
`org.apache.flink.table.catalog.ResolvedSchema`	`getResolvedSchema()`	Resolved schema of this operation.

Methods inherited from interface org.apache.flink.table.operations.Operation
asSummaryString

- Method Detail
  - getResolvedSchema
```
org.apache.flink.table.catalog.ResolvedSchema getResolvedSchema()
```
    Resolved schema of this operation.
  - asSerializableString
```
default String asSerializableString()
```
    Returns a SQL string that fully serializes this instance. The serialized string can be used for storing the query in e.g. a Catalog as a view.
    
    Returns:
    
    detailed string for persisting in a catalog
    
    See Also:
    
    Operation.asSummaryString()
  - asSerializableString
```
default String asSerializableString(org.apache.flink.table.expressions.SqlFactory sqlFactory)
```
    Returns a SQL string that fully serializes this instance. The serialized string can be used for storing the query in e.g. a Catalog as a view.
    
    Parameters:
    
    sqlFactory - can be used to customize the serialization to a SQL string
    
    Returns:
    
    Flink SQL string for persisting in a catalog
    
    See Also:
    
    Operation.asSummaryString(), EnvironmentSettings.Builder.withSqlFactory(SqlFactory)
  - getChildren
```
List<QueryOperation> getChildren()
```
  - accept
```
default <T> T accept(QueryOperationVisitor<T> visitor)
```