MappingUtil

java.lang.Object
- org.apache.iceberg.mapping.MappingUtil

public class MappingUtil
extends java.lang.Object

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static NameMapping`	`create(Schema schema)`	Create a name-based mapping for a schema.
`static NameMapping`	`update(NameMapping mapping, java.util.Map<java.lang.Integer,Types.NestedField> updates, org.apache.iceberg.relocated.com.google.common.collect.Multimap<java.lang.Integer,Types.NestedField> adds)`	Update a name-based mapping using changes to a schema.

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

- Method Detail
  - create
```
public static NameMapping create(Schema schema)
```
    Create a name-based mapping for a schema.
    The mapping returned by this method will use the schema's name for each field.
    
    Parameters:
    
    schema - a Schema
    
    Returns:
    
    a NameMapping initialized with the schema's fields and names
  - update
```
public static NameMapping update(NameMapping mapping,
                                 java.util.Map<java.lang.Integer,Types.NestedField> updates,
                                 org.apache.iceberg.relocated.com.google.common.collect.Multimap<java.lang.Integer,Types.NestedField> adds)
```
    Update a name-based mapping using changes to a schema.
    
    Parameters:
    
    mapping - a name-based mapping
    
    updates - a map from field ID to updated field definitions
    
    adds - a map from parent field ID to nested fields to be added
    
    Returns:
    
    an updated mapping with names added to renamed fields and the mapping extended for new fields