1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/**
* 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.planner.physical;
import org.eigenbase.relopt.RelOptPlanner;
import org.eigenbase.relopt.RelTrait;
import org.eigenbase.relopt.RelTraitDef;
import com.google.common.collect.ImmutableList;
public class DrillDistributionTrait implements RelTrait {
public static enum DistributionType {SINGLETON, HASH_DISTRIBUTED, RANGE_DISTRIBUTED, RANDOM_DISTRIBUTED,
ROUND_ROBIN_DISTRIBUTED, BROADCAST_DISTRIBUTED, ANY};
public static DrillDistributionTrait SINGLETON = new DrillDistributionTrait(DistributionType.SINGLETON);
public static DrillDistributionTrait RANDOM_DISTRIBUTED = new DrillDistributionTrait(DistributionType.RANDOM_DISTRIBUTED);
public static DrillDistributionTrait ANY = new DrillDistributionTrait(DistributionType.ANY);
public static DrillDistributionTrait DEFAULT = ANY;
private DistributionType type;
private final ImmutableList<DistributionField> fields;
public DrillDistributionTrait(DistributionType type) {
assert (type == DistributionType.SINGLETON || type == DistributionType.RANDOM_DISTRIBUTED || type == DistributionType.ANY
|| type == DistributionType.ROUND_ROBIN_DISTRIBUTED || type == DistributionType.BROADCAST_DISTRIBUTED);
this.type = type;
this.fields = ImmutableList.<DistributionField>of();
}
public DrillDistributionTrait(DistributionType type, ImmutableList<DistributionField> fields) {
assert (type == DistributionType.HASH_DISTRIBUTED || type == DistributionType.RANGE_DISTRIBUTED);
this.type = type;
this.fields = fields;
}
@Override
public void register(RelOptPlanner planner) {
}
public boolean subsumes(RelTrait trait) {
if (trait instanceof DrillDistributionTrait) {
DistributionType requiredDist = ((DrillDistributionTrait) trait).getType();
if (requiredDist == DistributionType.ANY) {
return true;
}
if (this.type == DistributionType.HASH_DISTRIBUTED) {
if (requiredDist == DistributionType.HASH_DISTRIBUTED) {
// A subset of the required distribution columns can satisfy (subsume) the requirement
// e.g: required distribution: {a, b, c}
// Following can satisfy the requirements: {a}, {b}, {c}, {a, b}, {b, c}, {a, c} or {a, b, c}
// New: Use equals for subsumes check of hash distribution. If we uses subsumes,
// a join may end up with hash-distributions using different keys. This would
// cause incorrect query result.
return this.equals(trait);
}
else if (requiredDist == DistributionType.RANDOM_DISTRIBUTED) {
return true; // hash distribution subsumes random distribution and ANY distribution
}
}
}
return this.equals(trait);
}
public RelTraitDef<DrillDistributionTrait> getTraitDef() {
return DrillDistributionTraitDef.INSTANCE;
}
public DistributionType getType() {
return this.type;
}
public ImmutableList<DistributionField> getFields() {
return fields;
}
@Override
public int hashCode() {
return fields == null ? type.hashCode() : type.hashCode() | fields.hashCode() << 4 ;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof DrillDistributionTrait) {
DrillDistributionTrait that = (DrillDistributionTrait) obj;
return this.type == that.type && this.fields.equals(that.fields) ;
}
return false;
}
@Override
public String toString() {
return fields == null ? this.type.toString() : this.type.toString() + "(" + fields + ")";
}
public static class DistributionField {
/**
* 0-based index of field being DISTRIBUTED.
*/
private final int fieldId;
public DistributionField (int fieldId) {
this.fieldId = fieldId;
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof DistributionField)) {
return false;
}
DistributionField other = (DistributionField) obj;
return this.fieldId == other.fieldId;
}
@Override
public int hashCode() {
return this.fieldId;
}
public int getFieldId() {
return this.fieldId;
}
@Override
public String toString() {
return String.format("[$%s]", this.fieldId);
}
}
}
|
