org.apache.hudi.internal.schema.utils

Class SerDeHelper

java.lang.Object

org.apache.hudi.internal.schema.utils.SerDeHelper

public class SerDeHelper
extends Object

Utils of serialization and deserialization.

Field Summary

Fields

Modifier and Type	Field and Description
static String	LATEST_SCHEMA
static String	SCHEMAS

Method Summary

Modifier and Type	Method and Description
static InternalSchema	fromJson(com.fasterxml.jackson.databind.JsonNode jsonNode) Convert jsonNode to internalSchema.
static Option<InternalSchema>	fromJson(String json) Convert string to internalSchema.
static String	inheritSchemas(InternalSchema newSchema, String oldSchemas) Add the new schema to the historical schemas.
static TreeMap<Long,InternalSchema>	parseSchemas(String json) Convert json string to history internalSchemas.
static String	toJson(InternalSchema internalSchema) Convert internalSchemas to json.
static String	toJson(List<InternalSchema> internalSchemas) Convert history internalSchemas to json.

Methods inherited from class java.lang.Object

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

Field Detail

LATEST_SCHEMA

public static final String LATEST_SCHEMA

See Also:

Constant Field Values

SCHEMAS

public static final String SCHEMAS

See Also:

Constant Field Values

Method Detail

toJson

public static String toJson(List<InternalSchema> internalSchemas)

Convert history internalSchemas to json. this is used when save history schemas into hudi.

Parameters:

internalSchemas - history internal schemas

Returns:

a string

toJson

public static String toJson(InternalSchema internalSchema)

Convert internalSchemas to json.

Parameters:

internalSchema - a internal schema

Returns:

a string

fromJson

public static InternalSchema fromJson(com.fasterxml.jackson.databind.JsonNode jsonNode)

Convert jsonNode to internalSchema.

Parameters:

jsonNode - a jsonNode.

Returns:

a internalSchema.

fromJson

public static Option<InternalSchema> fromJson(String json)

Convert string to internalSchema.

Parameters:

json - a json string.

Returns:

a internalSchema.

parseSchemas

public static TreeMap<Long,InternalSchema> parseSchemas(String json)

Convert json string to history internalSchemas. TreeMap is used to hold history internalSchemas.

Parameters:

json - a json string

Returns:

a TreeMap

inheritSchemas

public static String inheritSchemas(InternalSchema newSchema,
                                    String oldSchemas)

Add the new schema to the historical schemas. use string operations to reduce overhead.

Parameters:

newSchema - a new internalSchema

oldSchemas - historical schemas string.

Returns:

a string.