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Write only key fields to delete files (#60)
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kafka-connect/src/main/java/io/tabular/iceberg/connect/data/RecordProjection.java
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|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| /* | ||
| * 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 io.tabular.iceberg.connect.data; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Map; | ||
| import org.apache.iceberg.Schema; | ||
| import org.apache.iceberg.data.Record; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
| import org.apache.iceberg.types.Types; | ||
| import org.apache.iceberg.types.Types.ListType; | ||
| import org.apache.iceberg.types.Types.MapType; | ||
| import org.apache.iceberg.types.Types.NestedField; | ||
| import org.apache.iceberg.types.Types.StructType; | ||
|
|
||
| /** | ||
| * This is modified from {@link org.apache.iceberg.util.StructProjection} to support record types. | ||
| */ | ||
| public class RecordProjection implements Record { | ||
|
|
||
| /** | ||
| * Creates a projecting wrapper for {@link Record} rows. | ||
| * | ||
| * <p>This projection does not work with repeated types like lists and maps. | ||
| * | ||
| * @param dataSchema schema of rows wrapped by this projection | ||
| * @param projectedSchema result schema of the projected rows | ||
| * @return a wrapper to project rows | ||
| */ | ||
| public static RecordProjection create(Schema dataSchema, Schema projectedSchema) { | ||
| return new RecordProjection(dataSchema.asStruct(), projectedSchema.asStruct()); | ||
| } | ||
|
|
||
| private final StructType type; | ||
| private final int[] positionMap; | ||
| private final RecordProjection[] nestedProjections; | ||
| private Record record; | ||
|
|
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| private RecordProjection(StructType structType, StructType projection) { | ||
| this(structType, projection, false); | ||
| } | ||
|
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| @SuppressWarnings("checkstyle:CyclomaticComplexity") | ||
| private RecordProjection(StructType structType, StructType projection, boolean allowMissing) { | ||
| this.type = projection; | ||
| this.positionMap = new int[projection.fields().size()]; | ||
| this.nestedProjections = new RecordProjection[projection.fields().size()]; | ||
|
|
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| // set up the projection positions and any nested projections that are needed | ||
| List<NestedField> dataFields = structType.fields(); | ||
| for (int pos = 0; pos < positionMap.length; pos += 1) { | ||
| Types.NestedField projectedField = projection.fields().get(pos); | ||
|
|
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| boolean found = false; | ||
| for (int i = 0; !found && i < dataFields.size(); i += 1) { | ||
| Types.NestedField dataField = dataFields.get(i); | ||
| if (projectedField.fieldId() == dataField.fieldId()) { | ||
| found = true; | ||
| positionMap[pos] = i; | ||
| switch (projectedField.type().typeId()) { | ||
| case STRUCT: | ||
| nestedProjections[pos] = | ||
| new RecordProjection( | ||
| dataField.type().asStructType(), projectedField.type().asStructType()); | ||
| break; | ||
| case MAP: | ||
| MapType projectedMap = projectedField.type().asMapType(); | ||
| MapType originalMap = dataField.type().asMapType(); | ||
|
|
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| boolean keyProjectable = | ||
| !projectedMap.keyType().isNestedType() | ||
| || projectedMap.keyType().equals(originalMap.keyType()); | ||
| boolean valueProjectable = | ||
| !projectedMap.valueType().isNestedType() | ||
| || projectedMap.valueType().equals(originalMap.valueType()); | ||
| Preconditions.checkArgument( | ||
| keyProjectable && valueProjectable, | ||
| "Cannot project a partial map key or value struct. Trying to project %s out of %s", | ||
| projectedField, | ||
| dataField); | ||
|
|
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| nestedProjections[pos] = null; | ||
| break; | ||
| case LIST: | ||
| ListType projectedList = projectedField.type().asListType(); | ||
| ListType originalList = dataField.type().asListType(); | ||
|
|
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| boolean elementProjectable = | ||
| !projectedList.elementType().isNestedType() | ||
| || projectedList.elementType().equals(originalList.elementType()); | ||
| Preconditions.checkArgument( | ||
| elementProjectable, | ||
| "Cannot project a partial list element struct. Trying to project %s out of %s", | ||
| projectedField, | ||
| dataField); | ||
|
|
||
| nestedProjections[pos] = null; | ||
| break; | ||
| default: | ||
| nestedProjections[pos] = null; | ||
| } | ||
| } | ||
| } | ||
|
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| if (!found && projectedField.isOptional() && allowMissing) { | ||
| positionMap[pos] = -1; | ||
| nestedProjections[pos] = null; | ||
| } else if (!found) { | ||
| throw new IllegalArgumentException( | ||
| String.format("Cannot find field %s in %s", projectedField, structType)); | ||
| } | ||
| } | ||
| } | ||
|
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| public RecordProjection wrap(Record newRecord) { | ||
| this.record = newRecord; | ||
| return this; | ||
| } | ||
|
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| @Override | ||
| public int size() { | ||
| return type.fields().size(); | ||
| } | ||
|
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| @Override | ||
| public <T> T get(int pos, Class<T> javaClass) { | ||
| // struct can be null if wrap is not called first before the get call | ||
| // or if a null struct is wrapped. | ||
| if (record == null) { | ||
| return null; | ||
| } | ||
|
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| int recordPos = positionMap[pos]; | ||
| if (nestedProjections[pos] != null) { | ||
| Record nestedStruct = record.get(recordPos, Record.class); | ||
| if (nestedStruct == null) { | ||
| return null; | ||
| } | ||
|
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| return javaClass.cast(nestedProjections[pos].wrap(nestedStruct)); | ||
| } | ||
|
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| if (recordPos != -1) { | ||
| return record.get(recordPos, javaClass); | ||
| } else { | ||
| return null; | ||
| } | ||
| } | ||
|
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| @Override | ||
| public <T> void set(int pos, T value) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public StructType struct() { | ||
| return type; | ||
| } | ||
|
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| @Override | ||
| public Object getField(String name) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public void setField(String name, Object value) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public Object get(int pos) { | ||
| return get(pos, Object.class); | ||
| } | ||
|
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| @Override | ||
| public Record copy() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public Record copy(Map<String, Object> overwriteValues) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
| } |
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