org.apache.iceberg

Interface UpdateSchema

All Superinterfaces:

PendingUpdate<Schema>

public interface UpdateSchema
extends PendingUpdate<Schema>

API for schema evolution.

When committing, these changes will be applied to the current table metadata. Commit conflicts will not be resolved and will result in a CommitFailedException.

Method Summary

Modifier and Type	Method and Description
default UpdateSchema	addColumn(java.lang.String parent, java.lang.String name, Type type) Add a new column to a nested struct.
UpdateSchema	addColumn(java.lang.String parent, java.lang.String name, Type type, java.lang.String doc) Add a new column to a nested struct.
default UpdateSchema	addColumn(java.lang.String name, Type type) Add a new top-level column.
UpdateSchema	addColumn(java.lang.String name, Type type, java.lang.String doc) Add a new top-level column.
default UpdateSchema	addRequiredColumn(java.lang.String parent, java.lang.String name, Type type) Add a new required top-level column.
UpdateSchema	addRequiredColumn(java.lang.String parent, java.lang.String name, Type type, java.lang.String doc) Add a new required top-level column.
default UpdateSchema	addRequiredColumn(java.lang.String name, Type type) Add a new required top-level column.
UpdateSchema	addRequiredColumn(java.lang.String name, Type type, java.lang.String doc) Add a new required top-level column.
UpdateSchema	allowIncompatibleChanges() Allow incompatible changes to the schema.
UpdateSchema	deleteColumn(java.lang.String name) Delete a column in the schema.
UpdateSchema	makeColumnOptional(java.lang.String name) Update a column to optional.
UpdateSchema	moveAfter(java.lang.String name, java.lang.String afterName) Move a column from its current position to directly after a reference column.
UpdateSchema	moveBefore(java.lang.String name, java.lang.String beforeName) Move a column from its current position to directly before a reference column.
UpdateSchema	moveFirst(java.lang.String name) Move a column from its current position to the start of the schema or its parent struct.
UpdateSchema	renameColumn(java.lang.String name, java.lang.String newName) Rename a column in the schema.
UpdateSchema	requireColumn(java.lang.String name) Update a column to required.
UpdateSchema	setIdentifierFields(java.util.Collection<java.lang.String> names) Set the identifier fields given a set of field names.
default UpdateSchema	setIdentifierFields(java.lang.String... names) Set the identifier fields given some field names.
UpdateSchema	unionByNameWith(Schema newSchema) Applies all field additions and updates from the provided new schema to the existing schema so to create a union schema.
UpdateSchema	updateColumn(java.lang.String name, Type.PrimitiveType newType) Update a column in the schema to a new primitive type.
default UpdateSchema	updateColumn(java.lang.String name, Type.PrimitiveType newType, java.lang.String newDoc) Update a column in the schema to a new primitive type.
UpdateSchema	updateColumnDoc(java.lang.String name, java.lang.String newDoc) Update a column in the schema to a new primitive type.

Methods inherited from interface org.apache.iceberg.PendingUpdate

apply, commit, updateEvent

Method Detail

allowIncompatibleChanges

UpdateSchema allowIncompatibleChanges()

Allow incompatible changes to the schema.

Incompatible changes can cause failures when attempting to read older data files. For example, adding a required column and attempting to read data files without that column will cause a failure. However, if there are no data files that are not compatible with the change, it can be allowed.

This option allows incompatible changes to be made to a schema. This should be used when the caller has validated that the change will not break. For example, if a column is added as optional but always populated and data older than the column addition has been deleted from the table, this can be used with requireColumn(String) to mark the column required.

Returns:

this for method chaining

addColumn

default UpdateSchema addColumn(java.lang.String name,
                               Type type)

Add a new top-level column.

Because "." may be interpreted as a column path separator or may be used in field names, it is not allowed in names passed to this method. To add to nested structures or to add fields with names that contain ".", use addColumn(String, String, Type).

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

name - name for the new column

type - type for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name contains "."

addColumn

UpdateSchema addColumn(java.lang.String name,
                       Type type,
                       java.lang.String doc)

Add a new top-level column.

Because "." may be interpreted as a column path separator or may be used in field names, it is not allowed in names passed to this method. To add to nested structures or to add fields with names that contain ".", use addColumn(String, String, Type).

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

name - name for the new column

type - type for the new column

doc - documentation string for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name contains "."

addColumn

default UpdateSchema addColumn(java.lang.String parent,
                               java.lang.String name,
                               Type type)

Add a new column to a nested struct.

The parent name is used to find the parent using Schema.findField(String). If the parent name is null, the new column will be added to the root as a top-level column. If parent identifies a struct, a new column is added to that struct. If it identifies a list, the column is added to the list element struct, and if it identifies a map, the new column is added to the map's value struct.

The given name is used to name the new column and names containing "." are not handled differently.

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

parent - name of the parent struct to the column will be added to

name - name for the new column

type - type for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If parent doesn't identify a struct

addColumn

UpdateSchema addColumn(java.lang.String parent,
                       java.lang.String name,
                       Type type,
                       java.lang.String doc)

Add a new column to a nested struct.

The parent name is used to find the parent using Schema.findField(String). If the parent name is null, the new column will be added to the root as a top-level column. If parent identifies a struct, a new column is added to that struct. If it identifies a list, the column is added to the list element struct, and if it identifies a map, the new column is added to the map's value struct.

The given name is used to name the new column and names containing "." are not handled differently.

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

parent - name of the parent struct to the column will be added to

name - name for the new column

type - type for the new column

doc - documentation string for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If parent doesn't identify a struct

addRequiredColumn

default UpdateSchema addRequiredColumn(java.lang.String name,
                                       Type type)

Add a new required top-level column.

This is an incompatible change that can break reading older data. This method will result in an exception unless allowIncompatibleChanges() has been called.

Because "." may be interpreted as a column path separator or may be used in field names, it is not allowed in names passed to this method. To add to nested structures or to add fields with names that contain ".", use addRequiredColumn(String, String, Type).

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

name - name for the new column

type - type for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name contains "."

addRequiredColumn

UpdateSchema addRequiredColumn(java.lang.String name,
                               Type type,
                               java.lang.String doc)

Add a new required top-level column.

This is an incompatible change that can break reading older data. This method will result in an exception unless allowIncompatibleChanges() has been called.

Because "." may be interpreted as a column path separator or may be used in field names, it is not allowed in names passed to this method. To add to nested structures or to add fields with names that contain ".", use addRequiredColumn(String, String, Type).

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

name - name for the new column

type - type for the new column

doc - documentation string for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name contains "."

addRequiredColumn

default UpdateSchema addRequiredColumn(java.lang.String parent,
                                       java.lang.String name,
                                       Type type)

Add a new required top-level column.

This is an incompatible change that can break reading older data. This method will result in an exception unless allowIncompatibleChanges() has been called.

The parent name is used to find the parent using Schema.findField(String). If the parent name is null, the new column will be added to the root as a top-level column. If parent identifies a struct, a new column is added to that struct. If it identifies a list, the column is added to the list element struct, and if it identifies a map, the new column is added to the map's value struct.

The given name is used to name the new column and names containing "." are not handled differently.

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

parent - name of the parent struct to the column will be added to

name - name for the new column

type - type for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If parent doesn't identify a struct

addRequiredColumn

UpdateSchema addRequiredColumn(java.lang.String parent,
                               java.lang.String name,
                               Type type,
                               java.lang.String doc)

Add a new required top-level column.

This is an incompatible change that can break reading older data. This method will result in an exception unless allowIncompatibleChanges() has been called.

The parent name is used to find the parent using Schema.findField(String). If the parent name is null, the new column will be added to the root as a top-level column. If parent identifies a struct, a new column is added to that struct. If it identifies a list, the column is added to the list element struct, and if it identifies a map, the new column is added to the map's value struct.

The given name is used to name the new column and names containing "." are not handled differently.

If type is a nested type, its field IDs are reassigned when added to the existing schema.

Parameters:

parent - name of the parent struct to the column will be added to

name - name for the new column

type - type for the new column

doc - documentation string for the new column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If parent doesn't identify a struct

renameColumn

UpdateSchema renameColumn(java.lang.String name,
                          java.lang.String newName)

Rename a column in the schema.

The name is used to find the column to rename using Schema.findField(String).

The new name may contain "." and such names are not parsed or handled differently.

Columns may be updated and renamed in the same schema update.

Parameters:

name - name of the column to rename

newName - replacement name for the column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change conflicts with other additions, renames, or updates.

updateColumn

UpdateSchema updateColumn(java.lang.String name,
                          Type.PrimitiveType newType)

Update a column in the schema to a new primitive type.

The name is used to find the column to update using Schema.findField(String).

Only updates that widen types are allowed.

Columns may be updated and renamed in the same schema update.

Parameters:

name - name of the column to rename

newType - replacement type for the column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change introduces a type incompatibility or if it conflicts with other additions, renames, or updates.

updateColumn

default UpdateSchema updateColumn(java.lang.String name,
                                  Type.PrimitiveType newType,
                                  java.lang.String newDoc)

Update a column in the schema to a new primitive type.

The name is used to find the column to update using Schema.findField(String).

Only updates that widen types are allowed.

Columns may be updated and renamed in the same schema update.

Parameters:

name - name of the column to rename

newType - replacement type for the column

newDoc - replacement documentation string for the column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change introduces a type incompatibility or if it conflicts with other additions, renames, or updates.

updateColumnDoc

UpdateSchema updateColumnDoc(java.lang.String name,
                             java.lang.String newDoc)

Update a column in the schema to a new primitive type.

The name is used to find the column to update using Schema.findField(String).

Columns may be updated and renamed in the same schema update.

Parameters:

name - name of the column to rename

newDoc - replacement documentation string for the column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change introduces a type incompatibility or if it conflicts with other additions, renames, or updates.

makeColumnOptional

UpdateSchema makeColumnOptional(java.lang.String name)

Update a column to optional.

Parameters:

name - name of the column to mark optional

Returns:

this for method chaining

requireColumn

UpdateSchema requireColumn(java.lang.String name)

Update a column to required.

This is an incompatible change that can break reading older data. This method will result in an exception unless allowIncompatibleChanges() has been called.

Parameters:

name - name of the column to mark required

Returns:

this for method chaining

deleteColumn

UpdateSchema deleteColumn(java.lang.String name)

Delete a column in the schema.

The name is used to find the column to delete using Schema.findField(String).

Parameters:

name - name of the column to delete

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change conflicts with other additions, renames, or updates.

moveFirst

UpdateSchema moveFirst(java.lang.String name)

Move a column from its current position to the start of the schema or its parent struct.

Parameters:

name - name of the column to move

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change conflicts with other changes.

moveBefore

UpdateSchema moveBefore(java.lang.String name,
                        java.lang.String beforeName)

Move a column from its current position to directly before a reference column.

The name is used to find the column to move using Schema.findField(String). If the name identifies a nested column, it can only be moved within the nested struct that contains it.

Parameters:

name - name of the column to move

beforeName - name of the reference column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change conflicts with other changes.

moveAfter

UpdateSchema moveAfter(java.lang.String name,
                       java.lang.String afterName)

Move a column from its current position to directly after a reference column.

The name is used to find the column to move using Schema.findField(String). If the name identifies a nested column, it can only be moved within the nested struct that contains it.

Parameters:

name - name of the column to move

afterName - name of the reference column

Returns:

this for method chaining

Throws:

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change conflicts with other changes.

unionByNameWith

UpdateSchema unionByNameWith(Schema newSchema)

Applies all field additions and updates from the provided new schema to the existing schema so to create a union schema.

For fields with same canonical names in both schemas it is required that the widen types is supported using updateColumn(String, Type.PrimitiveType)

Only supports turning a previously required field into an optional one if it is marked optional in the provided new schema using makeColumnOptional(String)

Only supports updating existing field docs with fields docs from the provided new schema using updateColumnDoc(String, String)

Parameters:

newSchema - a schema used in conjunction with the existing schema to create a union schema

Returns:

this for method chaining

Throws:

java.lang.IllegalStateException - If it encounters errors during provided schema traversal

java.lang.IllegalArgumentException - If name doesn't identify a column in the schema or if this change introduces a type incompatibility or if it conflicts with other additions, renames, or updates.

setIdentifierFields

UpdateSchema setIdentifierFields(java.util.Collection<java.lang.String> names)

Set the identifier fields given a set of field names.

Because identifier fields are unique, duplicated names will be ignored. See Schema.identifierFieldIds() to learn more about Iceberg identifier.

Parameters:

names - names of the columns to set as identifier fields

Returns:

this for method chaining

setIdentifierFields

default UpdateSchema setIdentifierFields(java.lang.String... names)

Set the identifier fields given some field names. See setIdentifierFields(Collection) for more details.

Parameters:

names - names of the columns to set as identifier fields

Returns:

this for method chaining