| /* |
| * 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.physical.resultSet.project; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.drill.common.expression.PathSegment.NameSegment; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.exec.physical.resultSet.project.RequestedTuple.RequestedColumn; |
| |
| /** |
| * Represents one name element. Like a {@link NameSegment}, except that this |
| * version is an aggregate. If the projection list contains `a.b` and `a.c`, |
| * then one name segment exists for a, and contains segments for both b and c. |
| */ |
| |
| public class RequestedColumnImpl implements RequestedColumn { |
| |
| /** |
| * Special marker to indicate that that a) the item is an |
| * array, and b) that all indexes are to be projected. |
| * Used when seeing both a and a[x]. |
| */ |
| |
| private static final Set<Integer> ALL_INDEXES = new HashSet<>(); |
| |
| private final RequestedTuple parent; |
| private final String name; |
| private RequestedTuple members; |
| private Set<Integer> indexes; |
| private ProjectionType type; |
| |
| public RequestedColumnImpl(RequestedTuple parent, String name) { |
| this.parent = parent; |
| this.name = name; |
| setType(); |
| } |
| |
| public RequestedColumnImpl(RequestedTuple parent, String name, ProjectionType type) { |
| this.parent = parent; |
| this.name = name; |
| this.type = type; |
| } |
| |
| @Override |
| public String name() { return name; } |
| @Override |
| public ProjectionType type() { return type; } |
| @Override |
| public boolean isWildcard() { return type == ProjectionType.WILDCARD; } |
| @Override |
| public boolean isSimple() { return type == ProjectionType.GENERAL; } |
| |
| @Override |
| public boolean isArray() { return type.isArray(); } |
| |
| @Override |
| public boolean isTuple() { return type.isTuple(); } |
| |
| @Override |
| public boolean isDict() { |
| return type.isDict(); |
| } |
| |
| public RequestedTuple asTuple() { |
| if (members == null) { |
| members = new RequestedTupleImpl(this); |
| setType(); |
| } |
| return members; |
| } |
| |
| public RequestedTuple projectAllMembers(boolean projectAll) { |
| members = projectAll ? ImpliedTupleRequest.ALL_MEMBERS : ImpliedTupleRequest.NO_MEMBERS; |
| setType(); |
| return members; |
| } |
| |
| public void addIndex(int index) { |
| if (indexes == null) { |
| indexes = new HashSet<>(); |
| } |
| if (indexes != ALL_INDEXES) { |
| indexes.add(index); |
| } |
| setType(); |
| } |
| |
| public void projectAllElements() { |
| indexes = ALL_INDEXES; |
| setType(); |
| } |
| |
| @Override |
| public boolean hasIndexes() { |
| return indexes != null && indexes != ALL_INDEXES; |
| } |
| |
| @Override |
| public boolean hasIndex(int index) { |
| return hasIndexes() ? indexes.contains(index) : false; |
| } |
| |
| @Override |
| public int maxIndex() { |
| if (! hasIndexes()) { |
| return 0; |
| } |
| int max = 0; |
| for (final Integer index : indexes) { |
| max = Math.max(max, index); |
| } |
| return max; |
| } |
| |
| @Override |
| public boolean[] indexes() { |
| if (! hasIndexes()) { |
| return null; |
| } |
| final int max = maxIndex(); |
| final boolean map[] = new boolean[max+1]; |
| for (final Integer index : indexes) { |
| map[index] = true; |
| } |
| return map; |
| } |
| |
| @Override |
| public String fullName() { |
| final StringBuilder buf = new StringBuilder(); |
| buildName(buf); |
| return buf.toString(); |
| } |
| |
| public boolean isRoot() { return parent == null; } |
| |
| private void setType() { |
| if (name.equals(SchemaPath.DYNAMIC_STAR)) { |
| type = ProjectionType.WILDCARD; |
| } else if (indexes != null && members != null) { |
| type = ProjectionType.TUPLE_ARRAY; |
| } |
| else if (indexes != null) { |
| type = ProjectionType.ARRAY; |
| } else if (members != null) { |
| type = ProjectionType.TUPLE; |
| } else { |
| type = ProjectionType.GENERAL; |
| } |
| } |
| |
| protected void buildName(StringBuilder buf) { |
| parent.buildName(buf); |
| buf.append('`') |
| .append(name) |
| .append('`'); |
| } |
| |
| @Override |
| public String summary() { |
| switch (type) { |
| case ARRAY: |
| return "array column"; |
| case TUPLE: |
| return "map column"; |
| case TUPLE_ARRAY: |
| return "repeated map"; |
| case DICT: |
| return "dict column"; |
| case DICT_ARRAY: |
| return "repeated dict column"; |
| case WILDCARD: |
| return "wildcard"; |
| default: |
| return "column"; |
| } |
| } |
| |
| @Override |
| public boolean nameEquals(String target) { |
| return name.equalsIgnoreCase(target); |
| } |
| |
| @Override |
| public RequestedTuple mapProjection() { |
| switch (type) { |
| case ARRAY: |
| case GENERAL: |
| // Don't know if the target is a tuple or not. |
| |
| return ImpliedTupleRequest.ALL_MEMBERS; |
| case TUPLE: |
| case TUPLE_ARRAY: |
| return members == null ? ImpliedTupleRequest.ALL_MEMBERS : members; |
| case UNPROJECTED: |
| return ImpliedTupleRequest.NO_MEMBERS; |
| default: |
| return null; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder buf = new StringBuilder(); |
| buf |
| .append("[") |
| .append(getClass().getSimpleName()) |
| .append(" name=") |
| .append(name()) |
| .append(", type=") |
| .append(summary()); |
| if (isArray()) { |
| buf |
| .append(", array=") |
| .append(indexes); |
| } |
| if (isTuple()) { |
| buf |
| .append(", tuple=") |
| .append(members); |
| } |
| buf.append("]"); |
| return buf.toString(); |
| } |
| } |