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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.utils;
import org.apache.hudi.internal.schema.InternalSchema;
import org.apache.hudi.internal.schema.Type;
import org.apache.hudi.internal.schema.Types;
import org.apache.hudi.internal.schema.action.TableChanges;
import org.apache.hudi.internal.schema.action.TableChangesHelper;
import java.util.ArrayList;
import java.util.List;
/**
* Helper methods for schema Change.
*/
public class SchemaChangeUtils {
private SchemaChangeUtils() {
}
/**
* 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.
*
* @param src origin column type.
* @param dsr new column type.
* @return whether to allow the column type to be updated.
*/
public static boolean isTypeUpdateAllow(Type src, Type dsr) {
if (src.isNestedType() || dsr.isNestedType()) {
throw new IllegalArgumentException("only support update primitive type");
}
if (src.equals(dsr)) {
return true;
}
switch (src.typeId()) {
case INT:
return dsr == Types.LongType.get() || dsr == Types.FloatType.get()
|| dsr == Types.DoubleType.get() || dsr == Types.StringType.get() || dsr.typeId() == Type.TypeID.DECIMAL;
case LONG:
return dsr == Types.FloatType.get() || dsr == Types.DoubleType.get() || dsr == Types.StringType.get() || dsr.typeId() == Type.TypeID.DECIMAL;
case FLOAT:
return dsr == Types.DoubleType.get() || dsr == Types.StringType.get() || dsr.typeId() == Type.TypeID.DECIMAL;
case DOUBLE:
return dsr == Types.StringType.get() || dsr.typeId() == Type.TypeID.DECIMAL;
case DATE:
return dsr == Types.StringType.get();
case DECIMAL:
if (dsr.typeId() == Type.TypeID.DECIMAL) {
Types.DecimalType decimalSrc = (Types.DecimalType)src;
Types.DecimalType decimalDsr = (Types.DecimalType)dsr;
if (decimalDsr.isWiderThan(decimalSrc)) {
return true;
}
if (decimalDsr.precision() >= decimalSrc.precision() && decimalDsr.scale() == decimalSrc.scale()) {
return true;
}
} else if (dsr.typeId() == Type.TypeID.STRING) {
return true;
}
break;
case STRING:
return dsr == Types.DateType.get() || dsr.typeId() == Type.TypeID.DECIMAL;
default:
return false;
}
return false;
}
/**
* Apply all the DDL add operations to internalSchema to produce a new internalSchema.
*
* @param internalSchema origin internalSchema.
* @param adds a wrapper class for all the DDL add operations.
* @return a new internalSchema.
*/
public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnAddChange adds) {
Types.RecordType newType = (Types.RecordType)applyTableChange2Type(internalSchema.getRecord(), adds);
// deal with root level changes
List newFields = TableChangesHelper.applyAddChange2Fields(newType.fields(),
adds.getParentId2AddCols().get(-1), adds.getPositionChangeMap().get(-1));
return new InternalSchema(Types.RecordType.get(newFields, newType.name()));
}
/**
* 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.
*
* @param type origin hudi Type.
* @param adds a wrapper class for all the DDL add operations.
* @return a new internalSchema.
*/
public static Type applyTableChange2Type(Type type, TableChanges.ColumnAddChange adds) {
switch (type.typeId()) {
case RECORD:
Types.RecordType record = (Types.RecordType) type;
List newTypes = new ArrayList<>();
for (Types.Field f : record.fields()) {
Type newType = applyTableChange2Type(f.type(), adds);
// try to apply add
newTypes.add(newType.isNestedType() ? adds.applyAdd(f, newType) : newType);
}
List newFields = new ArrayList<>();
boolean hasChanged = false;
for (int i = 0; i < newTypes.size(); i++) {
Type newType = newTypes.get(i);
Types.Field oldfield = record.fields().get(i);
if (oldfield.type() == newType) {
newFields.add(oldfield);
} else {
hasChanged = true;
newFields.add(Types.Field.get(oldfield.fieldId(), oldfield.isOptional(), oldfield.name(), newType, oldfield.doc()));
}
}
return hasChanged ? Types.RecordType.get(newFields, record.name()) : record;
case ARRAY:
Types.ArrayType array = (Types.ArrayType) type;
Type newElementType;
Types.Field elementField = array.field(array.elementId());
newElementType = applyTableChange2Type(array.elementType(), adds);
// try to apply add
newElementType = adds.applyAdd(elementField, newElementType);
if (newElementType == array.elementType()) {
return array;
}
return Types.ArrayType.get(array.elementId(), array.isElementOptional(), newElementType);
case MAP:
Types.MapType map = (Types.MapType) type;
Type newValueType;
Types.Field valueField = map.field(map.valueId());
if (adds.getParentId2AddCols().containsKey(map.keyId())) {
throw new IllegalArgumentException("Cannot add fields to map keys: " + map);
}
newValueType = applyTableChange2Type(map.valueType(), adds);
// try to apply add
newValueType = adds.applyAdd(valueField, newValueType);
if (newValueType == map.valueType()) {
return map;
}
return Types.MapType.get(map.keyId(), map.valueId(), map.keyType(), newValueType, map.isValueOptional());
default:
return type;
}
}
/**
* Apply all the DDL delete operations to internalSchema to produce a new internalSchema.
*
* @param internalSchema origin internalSchema.
* @param deletes a wrapper class for all the DDL delete operations.
* @return a new internalSchema.
*/
public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnDeleteChange deletes) {
return new InternalSchema((Types.RecordType)applyTableChange2Type(internalSchema.getRecord(), deletes));
}
/**
* Apply all the DDL delete operations to Type to produce a new internalSchema.
* do not call this method directly. expose this method only for UT.
*
* @param type origin type.
* @param deletes a wrapper class for all the DDL delete operations.
* @return a new internalSchema.
*/
private static Type applyTableChange2Type(Type type, TableChanges.ColumnDeleteChange deletes) {
switch (type.typeId()) {
case RECORD:
Types.RecordType record = (Types.RecordType) type;
List fields = new ArrayList<>();
for (Types.Field f : record.fields()) {
Type newType = applyTableChange2Type(f.type(), deletes);
// apply delete
newType = deletes.applyDelete(f.fieldId(), newType);
if (newType != null) {
fields.add(Types.Field.get(f.fieldId(), f.isOptional(), f.name(), newType, f.doc()));
}
}
if (fields.isEmpty()) {
throw new UnsupportedOperationException("cannot support delete all columns from Struct");
}
return Types.RecordType.get(fields, record.name());
case ARRAY:
Types.ArrayType array = (Types.ArrayType) type;
Type newElementType = applyTableChange2Type(array.elementType(), deletes);
newElementType = deletes.applyDelete(array.elementId(), newElementType);
if (newElementType == null) {
throw new IllegalArgumentException(String.format("cannot delete element from arrayType: %s", array));
}
return Types.ArrayType.get(array.elementId(), array.isElementOptional(), newElementType);
case MAP:
Types.MapType map = (Types.MapType) type;
int keyId = map.fields().get(0).fieldId();
if (deletes.getDeletes().contains(keyId)) {
throw new IllegalArgumentException(String.format("cannot delete key from mapType: %s", map));
}
Type newValueType = applyTableChange2Type(map.valueType(), deletes);
newValueType = deletes.applyDelete(map.valueId(), newValueType);
if (newValueType == null) {
throw new IllegalArgumentException(String.format("cannot delete value from mapType: %s", map));
}
return Types.MapType.get(map.keyId(), map.valueId(), map.keyType(), newValueType, map.isValueOptional());
default:
return type;
}
}
/**
* Apply all the DDL update operations to internalSchema to produce a new internalSchema.
*
* @param internalSchema origin internalSchema.
* @param updates a wrapper class for all the DDL update operations.
* @return a new internalSchema.
*/
public static InternalSchema applyTableChanges2Schema(InternalSchema internalSchema, TableChanges.ColumnUpdateChange updates) {
Types.RecordType newType = (Types.RecordType)applyTableChange2Type(internalSchema.getRecord(), updates);
// deal with root level changes
List newFields = TableChangesHelper.applyAddChange2Fields(newType.fields(),
new ArrayList<>(), updates.getPositionChangeMap().get(-1));
return new InternalSchema(Types.RecordType.get(newFields, newType.name()));
}
/**
* Apply all the DDL update operations to type to produce a new internalSchema.
* do not call this method directly. expose this method only for UT.
*
* @param type origin internalSchema.
* @param updates a wrapper class for all the DDL update operations.
* @return a new internalSchema.
*/
private static Type applyTableChange2Type(Type type, TableChanges.ColumnUpdateChange updates) {
switch (type.typeId()) {
case RECORD:
Types.RecordType record = (Types.RecordType) type;
List newTypes = new ArrayList<>();
for (Types.Field f : record.fields()) {
Type newType = applyTableChange2Type(f.type(), updates);
newTypes.add(updates.applyUpdates(f, newType));
}
List newFields = new ArrayList<>();
for (int i = 0; i < newTypes.size(); i++) {
Type newType = newTypes.get(i);
Types.Field oldField = record.fields().get(i);
Types.Field updateField = updates.getUpdates().get(oldField.fieldId());
if (updateField != null) {
newFields.add(Types.Field.get(oldField.fieldId(), updateField.isOptional(), updateField.name(), newType, updateField.doc()));
} else if (!oldField.type().equals(newType)) {
newFields.add(Types.Field.get(oldField.fieldId(), oldField.isOptional(), oldField.name(), newType, oldField.doc()));
} else {
newFields.add(oldField);
}
}
return Types.RecordType.get(newFields, record.name());
case ARRAY:
Types.ArrayType array = (Types.ArrayType) type;
Type newElementType;
Types.Field elementField = array.fields().get(0);
newElementType = applyTableChange2Type(array.elementType(), updates);
newElementType = updates.applyUpdates(elementField, newElementType);
Types.Field elementUpdate = updates.getUpdates().get(elementField.fieldId());
boolean optional = elementUpdate == null ? array.isElementOptional() : elementUpdate.isOptional();
if (optional == elementField.isOptional() && array.elementType() == newElementType) {
return array;
}
return Types.ArrayType.get(array.elementId(), optional, newElementType);
case MAP:
Types.MapType map = (Types.MapType) type;
Types.Field valueFiled = map.fields().get(1);
Type newValueType;
newValueType = applyTableChange2Type(map.valueType(), updates);
newValueType = updates.applyUpdates(valueFiled, newValueType);
Types.Field valueUpdate = updates.getUpdates().get(valueFiled.fieldId());
boolean valueOptional = valueUpdate == null ? map.isValueOptional() : valueUpdate.isOptional();
if (valueOptional == map.isValueOptional() && map.valueType() == newValueType) {
return map;
}
return Types.MapType.get(map.keyId(), map.valueId(), map.keyType(), newValueType, valueOptional);
default:
return type;
}
}
}
