| /* |
| * 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.drill.exec.record.metadata; |
| |
| import java.util.List; |
| |
| import org.apache.drill.common.types.TypeProtos.DataMode; |
| import org.apache.drill.common.types.TypeProtos.MajorType; |
| import org.apache.drill.common.types.TypeProtos.MinorType; |
| import org.apache.drill.exec.record.MaterializedField; |
| |
| public class VariantColumnMetadata extends AbstractColumnMetadata { |
| |
| private final VariantSchema variantSchema; |
| |
| public VariantColumnMetadata(MaterializedField schema) { |
| super(schema); |
| variantSchema = new VariantSchema(); |
| variantSchema.bind(this); |
| List<MinorType> types; |
| if (type() == MinorType.UNION) { |
| types = schema.getType().getSubTypeList(); |
| } else { |
| assert type() == MinorType.LIST; |
| MaterializedField child; |
| MinorType childType; |
| if (schema.getChildren().isEmpty()) { |
| child = null; |
| childType = MinorType.LATE; |
| } else { |
| child = schema.getChildren().iterator().next(); |
| childType = child.getType().getMinorType(); |
| } |
| switch (childType) { |
| case UNION: |
| |
| // List contains a union. |
| |
| types = child.getType().getSubTypeList(); |
| break; |
| |
| case LATE: |
| |
| // List has no type. |
| |
| return; |
| |
| default: |
| |
| // List contains a single non-null type. |
| |
| variantSchema.addType(MetadataUtils.fromField(child)); |
| return; |
| } |
| } |
| if (types == null) { |
| return; |
| } |
| for (MinorType type : types) { |
| variantSchema.addType(type); |
| } |
| } |
| |
| public VariantColumnMetadata(MaterializedField schema, VariantSchema variantSchema) { |
| super(schema); |
| this.variantSchema = variantSchema; |
| } |
| |
| private VariantColumnMetadata(String name, MinorType type, DataMode mode, |
| VariantSchema variantSchema) { |
| super(name, type, mode); |
| this.variantSchema = variantSchema; |
| this.variantSchema.bind(this); |
| } |
| |
| public static VariantColumnMetadata union(String name) { |
| return unionOf(name, null); |
| } |
| |
| public static VariantColumnMetadata unionOf(String name, VariantSchema variantSchema) { |
| return new VariantColumnMetadata(name, MinorType.UNION, DataMode.OPTIONAL, |
| variantSchemaFor(variantSchema)); |
| } |
| |
| public static VariantColumnMetadata unionOf(MaterializedField schema, VariantSchema variantSchema) { |
| return new VariantColumnMetadata(schema, variantSchemaFor(variantSchema)); |
| } |
| |
| public static VariantColumnMetadata list(String name) { |
| return new VariantColumnMetadata(name, MinorType.LIST, DataMode.OPTIONAL, new VariantSchema()); |
| } |
| |
| public static VariantColumnMetadata listOf(String name, VariantSchema variantSchema) { |
| return new VariantColumnMetadata(name, MinorType.LIST, DataMode.OPTIONAL, |
| variantSchemaFor(variantSchema)); |
| } |
| |
| public static VariantColumnMetadata variantOf(String name, MinorType type, VariantSchema variantSchema) { |
| switch (type) { |
| case UNION: |
| return unionOf(name, variantSchema); |
| case LIST: |
| return listOf(name, variantSchema); |
| default: |
| throw new IllegalArgumentException(type.name()); |
| } |
| } |
| |
| private static VariantSchema variantSchemaFor(VariantSchema variantSchema) { |
| return variantSchema == null ? new VariantSchema() : variantSchema; |
| } |
| |
| @Override |
| public StructureType structureType() { |
| return StructureType.VARIANT; |
| } |
| |
| @Override |
| public boolean isVariant() { return true; } |
| |
| @Override |
| public boolean isArray() { |
| return super.isArray() || type() == MinorType.LIST; |
| } |
| |
| @Override |
| public ColumnMetadata cloneEmpty() { |
| return new VariantColumnMetadata(name, type, mode, new VariantSchema()); |
| } |
| |
| @Override |
| public ColumnMetadata copy() { |
| return new VariantColumnMetadata(name, type, mode, variantSchema.copy()); |
| } |
| |
| @Override |
| public VariantMetadata variantSchema() { |
| return variantSchema; |
| } |
| |
| @Override |
| public String typeString() { |
| StringBuilder builder = new StringBuilder(); |
| if (isArray()) { |
| builder.append("ARRAY<"); |
| } |
| builder.append("UNION"); |
| if (isArray()) { |
| builder.append(">"); |
| } |
| return builder.toString(); |
| } |
| |
| @Override |
| public MaterializedField schema() { |
| return MaterializedField.create(name, |
| MajorType.newBuilder() |
| .setMinorType(type) |
| .setMode(DataMode.OPTIONAL) |
| .addAllSubType(variantSchema.types()) |
| .build()); |
| } |
| |
| @Override |
| public MaterializedField emptySchema() { |
| return MaterializedField.create(name, |
| MajorType.newBuilder() |
| .setMinorType(type) |
| .setMode(DataMode.OPTIONAL) |
| .build()); |
| } |
| |
| @Override |
| protected void appendContents(StringBuilder buf) { |
| buf.append(", variant: ") |
| .append(variantSchema().toString()); |
| } |
| |
| @Override |
| public boolean isEquivalent(ColumnMetadata o) { |
| if (!super.isEquivalent(o)) { |
| return false; |
| } |
| VariantColumnMetadata other = (VariantColumnMetadata) o; |
| return variantSchema.isEquivalent(other.variantSchema); |
| } |
| } |