spark OrcColumnVectorUtils 源码
spark OrcColumnVectorUtils 代码
文件路径：/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnVectorUtils.java
/*
* 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.spark.sql.execution.datasources.orc;
import org.apache.hadoop.hive.ql.exec.vector.*;
import org.apache.spark.sql.types.*;
/**
* Utility class for {@link OrcColumnVector}.
*/
class OrcColumnVectorUtils {
/**
* Convert a Hive's {@link ColumnVector} to a Spark's {@link OrcColumnVector}.
*
* @param type The data type of column vector
* @param vector Hive's column vector
* @return Spark's column vector
*/
static OrcColumnVector toOrcColumnVector(DataType type, ColumnVector vector) {
if (vector instanceof LongColumnVector ||
vector instanceof DoubleColumnVector ||
vector instanceof BytesColumnVector ||
vector instanceof DecimalColumnVector ||
vector instanceof TimestampColumnVector) {
return new OrcAtomicColumnVector(type, vector);
} else if (vector instanceof StructColumnVector) {
StructColumnVector structVector = (StructColumnVector) vector;
OrcColumnVector[] fields = new OrcColumnVector[structVector.fields.length];
int ordinal = 0;
for (StructField f : ((StructType) type).fields()) {
fields[ordinal] = toOrcColumnVector(f.dataType(), structVector.fields[ordinal]);
ordinal++;
}
return new OrcStructColumnVector(type, vector, fields);
} else if (vector instanceof ListColumnVector) {
ListColumnVector listVector = (ListColumnVector) vector;
OrcColumnVector dataVector = toOrcColumnVector(
((ArrayType) type).elementType(), listVector.child);
return new OrcArrayColumnVector(type, vector, dataVector);
} else if (vector instanceof MapColumnVector) {
MapColumnVector mapVector = (MapColumnVector) vector;
MapType mapType = (MapType) type;
OrcColumnVector keysVector = toOrcColumnVector(mapType.keyType(), mapVector.keys);
OrcColumnVector valuesVector = toOrcColumnVector(mapType.valueType(), mapVector.values);
return new OrcMapColumnVector(type, vector, keysVector, valuesVector);
} else {
throw new IllegalArgumentException(
String.format("OrcColumnVectorUtils.toOrcColumnVector should not take %s as type " +
"and %s as vector", type, vector));
}
}
}
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