org.apache.hudi.internal.schema.utils

Class SchemaChangeUtils

java.lang.Object

org.apache.hudi.internal.schema.utils.SchemaChangeUtils

public class SchemaChangeUtils
extends Object

Helper methods for schema Change.

Method Summary

Modifier and Type	Method and Description
static Type	applyTableChange2Type(Type type, TableChanges.ColumnAddChange adds) Apply all the DDL add operations to Type to produce a new internalSchema.
static InternalSchema	applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnAddChange adds) Apply all the DDL add operations to internalSchema to produce a new internalSchema.
static InternalSchema	applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnDeleteChange deletes) Apply all the DDL delete operations to internalSchema to produce a new internalSchema.
static InternalSchema	applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnUpdateChange updates) Apply all the DDL update operations to internalSchema to produce a new internalSchema.
static boolean	isTypeUpdateAllow(Type src, Type dsr) Whether to allow the column type to be updated.
static boolean	shouldPromoteType(Type src, Type dsr)

Methods inherited from class java.lang.Object

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

Method Detail

isTypeUpdateAllow

public static boolean isTypeUpdateAllow(Type src,
                                        Type dsr)

Whether to allow the column type to be updated. now only support: int => long/float/double/String/Decimal long => float/double/String/Decimal float => double/String/Decimal double => String/Decimal Decimal => Decimal/String String => date/decimal date => String TODO: support more type update.

Parameters:

src - origin column type.

dsr - new column type.

Returns:

whether to allow the column type to be updated.

shouldPromoteType

public static boolean shouldPromoteType(Type src,
                                        Type dsr)

applyTableChanges2Schema

public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema,
                                                      TableChanges.ColumnAddChange adds)

Apply all the DDL add operations to internalSchema to produce a new internalSchema.

Parameters:

internalSchema - origin internalSchema.

adds - a wrapper class for all the DDL add operations.

Returns:

a new internalSchema.

applyTableChange2Type

public static Type applyTableChange2Type(Type type,
                                         TableChanges.ColumnAddChange adds)

Apply all the DDL add operations to Type to produce a new internalSchema. do not call this method directly. expose this method only for UT.

Parameters:

type - origin hudi Type.

adds - a wrapper class for all the DDL add operations.

Returns:

a new internalSchema.

applyTableChanges2Schema

public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema,
                                                      TableChanges.ColumnDeleteChange deletes)

Apply all the DDL delete operations to internalSchema to produce a new internalSchema.

Parameters:

internalSchema - origin internalSchema.

deletes - a wrapper class for all the DDL delete operations.

Returns:

a new internalSchema.

applyTableChanges2Schema

public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema,
                                                      TableChanges.ColumnUpdateChange updates)

Apply all the DDL update operations to internalSchema to produce a new internalSchema.

Parameters:

internalSchema - origin internalSchema.

updates - a wrapper class for all the DDL update operations.

Returns:

a new internalSchema.