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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hudi.internal.schema.action;
import org.apache.hudi.common.model.HoodieRecord;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.internal.schema.HoodieSchemaException;
import org.apache.hudi.internal.schema.InternalSchema;
import org.apache.hudi.internal.schema.InternalSchemaBuilder;
import org.apache.hudi.internal.schema.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
/**
* TableChange subclasses represent requested changes to a table.
* now only column changes support.
* to do support partition changes
*/
public interface TableChange {
/* The action Type of schema change. */
enum ColumnChangeID {
ADD, UPDATE, DELETE, PROPERTY_CHANGE, REPLACE;
private String name;
private ColumnChangeID() {
this.name = this.name().toLowerCase(Locale.ROOT);
}
public String getName() {
return name;
}
}
static ColumnChangeID fromValue(String value) {
switch (value.toLowerCase(Locale.ROOT)) {
case "add":
return ColumnChangeID.ADD;
case "change":
return ColumnChangeID.UPDATE;
case "delete":
return ColumnChangeID.DELETE;
case "property":
return ColumnChangeID.PROPERTY_CHANGE;
case "replace":
return ColumnChangeID.REPLACE;
default:
throw new IllegalArgumentException("Invalid value of Type.");
}
}
ColumnChangeID columnChangeId();
default boolean withPositionChange() {
return false;
}
abstract class BaseColumnChange implements TableChange {
protected final InternalSchema internalSchema;
protected final Map id2parent;
protected final Map> positionChangeMap = new HashMap<>();
BaseColumnChange(InternalSchema schema) {
this.internalSchema = schema;
this.id2parent = InternalSchemaBuilder.getBuilder().index2Parents(schema.getRecord());
}
/**
* Add position change.
*
* @param srcName column which need to be reordered
* @param dsrName reference position
* @param orderType change types
* @return this
*/
public BaseColumnChange addPositionChange(String srcName, String dsrName, ColumnPositionChange.ColumnPositionType orderType) {
Integer srcId = findIdByFullName(srcName);
Option dsrIdOpt = dsrName.isEmpty() ? Option.empty() : Option.of(findIdByFullName(dsrName));
Integer srcParentId = id2parent.get(srcId);
Option dsrParentIdOpt = dsrIdOpt.map(id2parent::get);
// forbid adjust hoodie metadata columns.
switch (orderType) {
case BEFORE:
checkColModifyIsLegal(dsrName);
break;
case FIRST:
if (srcId == null || srcId == -1 || srcParentId == null || srcParentId == -1) {
throw new HoodieSchemaException("forbid adjust top-level columns position by using through first syntax");
}
break;
case AFTER:
List checkColumns = HoodieRecord.HOODIE_META_COLUMNS.subList(0, HoodieRecord.HOODIE_META_COLUMNS.size() - 2);
if (checkColumns.stream().anyMatch(f -> f.equalsIgnoreCase(dsrName))) {
throw new HoodieSchemaException("forbid adjust the position of ordinary columns between meta columns");
}
break;
case NO_OPERATION:
default:
break;
}
int parentId;
if (srcParentId != null && dsrParentIdOpt.isPresent() && srcParentId.equals(dsrParentIdOpt.get())) {
Types.Field parentField = internalSchema.findField(srcParentId);
if (!(parentField.type() instanceof Types.RecordType)) {
throw new HoodieSchemaException(String.format("only support reorder fields in struct type, but find: %s", parentField.type()));
}
parentId = parentField.fieldId();
} else if (srcParentId == null && !dsrParentIdOpt.isPresent()) {
parentId = -1;
} else if (srcParentId != null && !dsrParentIdOpt.isPresent() && orderType.equals(ColumnPositionChange.ColumnPositionType.FIRST)) {
parentId = srcParentId;
} else {
throw new HoodieSchemaException("cannot order position from different parent");
}
ArrayList changes = positionChangeMap.getOrDefault(parentId, new ArrayList<>());
changes.add(ColumnPositionChange.get(srcId, dsrIdOpt.orElse(-1), orderType));
positionChangeMap.put(parentId, changes);
return this;
}
public BaseColumnChange addPositionChange(String srcName, String dsrName, String orderType) {
return addPositionChange(srcName, dsrName, ColumnPositionChange.fromTypeValue(orderType));
}
/**
* Abstract method.
* give a column fullName and return the field id
*
* @param fullName column fullName
* @return field id of current column
*/
protected abstract Integer findIdByFullName(String fullName);
// Modify hudi meta columns is prohibited
protected void checkColModifyIsLegal(String colNeedToModfiy) {
if (HoodieRecord.HOODIE_META_COLUMNS.stream().anyMatch(f -> f.equalsIgnoreCase(colNeedToModfiy))) {
throw new IllegalArgumentException(String.format("cannot modify hudi meta col: %s", colNeedToModfiy));
}
}
@Override
public boolean withPositionChange() {
return false;
}
}
/**
* Column position change.
* now support three change types: FIRST/AFTER/BEFORE
* FIRST means the specified column should be the first column.
* AFTER means the specified column should be put after the given column.
* BEFORE means the specified column should be put before the given column.
* Note that, the specified column may be a nested field:
* AFTER/BEFORE means the given columns should in the same struct;
* FIRST means this field should be the first one within the struct.
*/
class ColumnPositionChange {
public enum ColumnPositionType {
FIRST,
BEFORE,
AFTER,
// only expose to internal use.
NO_OPERATION
}
static ColumnPositionType fromTypeValue(String value) {
switch (value.toLowerCase(Locale.ROOT)) {
case "first":
return ColumnPositionType.FIRST;
case "before":
return ColumnPositionType.BEFORE;
case "after":
return ColumnPositionType.AFTER;
case "no_operation":
return ColumnPositionType.NO_OPERATION;
default:
throw new IllegalArgumentException(String.format("only support first/before/after but found: %s", value));
}
}
private final int srcId;
private final int dsrId;
private final ColumnPositionType type;
static ColumnPositionChange first(int srcId) {
return new ColumnPositionChange(srcId, -1, ColumnPositionType.FIRST);
}
static ColumnPositionChange before(int srcId, int dsrId) {
return new ColumnPositionChange(srcId, dsrId, ColumnPositionType.BEFORE);
}
static ColumnPositionChange after(int srcId, int dsrId) {
return new ColumnPositionChange(srcId, dsrId, ColumnPositionType.AFTER);
}
static ColumnPositionChange get(int srcId, int dsrId, String type) {
return get(srcId, dsrId, fromTypeValue(type));
}
static ColumnPositionChange get(int srcId, int dsrId, ColumnPositionType type) {
switch (type) {
case FIRST:
return ColumnPositionChange.first(srcId);
case BEFORE:
return ColumnPositionChange.before(srcId, dsrId);
case AFTER:
return ColumnPositionChange.after(srcId, dsrId);
default:
throw new IllegalArgumentException(String.format("only support first/before/after but found: %s", type));
}
}
private ColumnPositionChange(int srcId, int dsrId, ColumnPositionType type) {
this.srcId = srcId;
this.dsrId = dsrId;
this.type = type;
}
public int getSrcId() {
return srcId;
}
public int getDsrId() {
return dsrId;
}
public ColumnPositionType type() {
return type;
}
}
}
