/**
* 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.hadoop.hive.ql.plan;
import java.util.HashMap;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
/**
* PartitionConversion.
*
*/
public class VectorPartitionConversion {
// Currently, we only support these no-precision-loss or promotion data type conversions:
//
// TinyInt --> SmallInt
// TinyInt --> Int
// TinyInt --> BigInt
//
// SmallInt -> Int
// SmallInt -> BigInt
//
// Int --> BigInt
//
// Float -> Double
//
// Since we stare Char without padding, it can become a String implicitly.
// (Char | VarChar) -> String
//
private static HashMap<PrimitiveCategory, PrimitiveCategory[]> implicitPrimitiveMap =
new HashMap<PrimitiveCategory, PrimitiveCategory[]>();
static {
implicitPrimitiveMap.put(
PrimitiveCategory.BOOLEAN,
new PrimitiveCategory[] {
PrimitiveCategory.BYTE, PrimitiveCategory.SHORT, PrimitiveCategory.INT, PrimitiveCategory.LONG });
implicitPrimitiveMap.put(
PrimitiveCategory.BYTE,
new PrimitiveCategory[] {
PrimitiveCategory.SHORT, PrimitiveCategory.INT, PrimitiveCategory.LONG });
implicitPrimitiveMap.put(
PrimitiveCategory.SHORT,
new PrimitiveCategory[] {
PrimitiveCategory.INT, PrimitiveCategory.LONG });
implicitPrimitiveMap.put(
PrimitiveCategory.INT,
new PrimitiveCategory[] {
PrimitiveCategory.LONG });
implicitPrimitiveMap.put(
PrimitiveCategory.FLOAT,
new PrimitiveCategory[] {
PrimitiveCategory.DOUBLE });
implicitPrimitiveMap.put(
PrimitiveCategory.CHAR,
new PrimitiveCategory[] {
PrimitiveCategory.STRING });
implicitPrimitiveMap.put(
PrimitiveCategory.VARCHAR,
new PrimitiveCategory[] {
PrimitiveCategory.STRING });
}
public static boolean isImplicitVectorColumnConversion(TypeInfo fromTypeInfo,
TypeInfo toTypeInfo) {
if (fromTypeInfo.getCategory() == Category.PRIMITIVE &&
toTypeInfo.getCategory() == Category.PRIMITIVE) {
PrimitiveCategory fromPrimitiveCategory =
((PrimitiveTypeInfo) fromTypeInfo).getPrimitiveCategory();
PrimitiveCategory toPrimitiveCategory =
((PrimitiveTypeInfo) toTypeInfo).getPrimitiveCategory();
PrimitiveCategory[] toPrimitiveCategories = implicitPrimitiveMap.get(fromPrimitiveCategory);
if (toPrimitiveCategories != null) {
for (PrimitiveCategory candidatePrimitiveCategory : toPrimitiveCategories) {
if (candidatePrimitiveCategory == toPrimitiveCategory) {
return true;
}
}
}
return false;
}
return false;
}
}