org.apache.hudi.internal.schema

Class InternalSchemaBuilder

java.lang.Object

org.apache.hudi.internal.schema.InternalSchemaBuilder

All Implemented Interfaces:

Serializable

public class InternalSchemaBuilder
extends Object
implements Serializable

A build class to help build fields for InternalSchema

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
Map<Integer,Types.Field>	buildIdToField(Type type) Build a mapping from id to field for a internal Type.
Map<Integer,String>	buildIdToName(Type type) Build a mapping from id to full field name for a internal Type.
Map<String,Integer>	buildNameToId(Type type) Build a mapping from full field name to id for a internal Type.
static InternalSchemaBuilder	getBuilder()
Map<Integer,Integer>	index2Parents(Types.RecordType record) Build a mapping which maintain the relation between child field id and it's parent field id.
Type	refreshNewId(Type type, AtomicInteger nextId) Assigns new ids for all fields in a Type, based on initial id.
<T> T	visit(InternalSchema schema, InternalSchemaVisitor<T> visitor) Use to traverse all types in internalSchema with visitor.
<T> T	visit(Type type, InternalSchemaVisitor<T> visitor)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getBuilder

public static InternalSchemaBuilder getBuilder()

buildIdToName

public Map<Integer,String> buildIdToName(Type type)

Build a mapping from id to full field name for a internal Type. if a field y belong to a struct filed x, then the full name of y is x.y

Parameters:

type - hoodie internal type

Returns:

a mapping from id to full field name

buildNameToId

public Map<String,Integer> buildNameToId(Type type)

Build a mapping from full field name to id for a internal Type. if a field y belong to a struct filed x, then the full name of y is x.y

Parameters:

type - hoodie internal type

Returns:

a mapping from full field name to id

visit

public <T> T visit(InternalSchema schema,
                   InternalSchemaVisitor<T> visitor)

Use to traverse all types in internalSchema with visitor.

Parameters:

schema - hoodie internal schema

Returns:

visitor expected result.

visit

public <T> T visit(Type type,
                   InternalSchemaVisitor<T> visitor)

buildIdToField

public Map<Integer,Types.Field> buildIdToField(Type type)

Build a mapping from id to field for a internal Type.

Parameters:

type - hoodie internal type

Returns:

a mapping from id to field

index2Parents

public Map<Integer,Integer> index2Parents(Types.RecordType record)

Build a mapping which maintain the relation between child field id and it's parent field id. if a child field y(which id is 9) belong to a nest field x(which id is 6), then (9 -> 6) will be added to the result map. if a field has no parent field, nothings will be added.

Parameters:

record - hoodie record type.

Returns:

a mapping from id to parentId for a record Type

refreshNewId

public Type refreshNewId(Type type,
                         AtomicInteger nextId)

Assigns new ids for all fields in a Type, based on initial id.

Parameters:

type - a type.

nextId - initial id which used to fresh ids for all fields in a type

Returns:

a new type with new ids