/
ElasticsearchTypeCoercionHierarchy.java
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/
ElasticsearchTypeCoercionHierarchy.java
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/*
* Licensed 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.trino.plugin.elasticsearch.utility;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;
import java.util.PriorityQueue;
import static com.google.common.collect.ImmutableList.toImmutableList;
public enum ElasticsearchTypeCoercionHierarchy
{
// Integer variants
BYTE(0, 0), SHORT(0, 1), INTEGER(0, 2), LONG(0, 3),
// Float Variants
HALF_FLOAT(1, 0), FLOAT(1, 1), DOUBLE(1, 2);
int group;
int precision;
public int getGroup()
{
return group;
}
public int getPrecision()
{
return precision;
}
ElasticsearchTypeCoercionHierarchy(int group, int precision)
{
this.group = group;
this.precision = precision;
}
public static String getWiderDataType(Collection<String> dataTypes)
{
try {
List<ElasticsearchTypeCoercionHierarchy> elasticsearchDataTypes = dataTypes.stream()
.map(String::toUpperCase)
.map(ElasticsearchTypeCoercionHierarchy::valueOf)
.collect(toImmutableList());
final long numberOfBuckets = elasticsearchDataTypes.stream()
.map(ElasticsearchTypeCoercionHierarchy::getGroup)
.distinct()
.count();
if (numberOfBuckets > 1) {
return "text";
}
return widerType(elasticsearchDataTypes).toLowerCase(Locale.ROOT);
}
catch (IllegalArgumentException e) {
// Do nothing.
}
return "text";
}
private static String widerType(List<ElasticsearchTypeCoercionHierarchy> types)
{
PriorityQueue<ElasticsearchTypeCoercionHierarchy> heap = new PriorityQueue<>(Comparator.comparingInt(ElasticsearchTypeCoercionHierarchy::getPrecision).reversed());
heap.addAll(types);
return heap.poll().name();
}
}