iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/transformation/dag/column/unary/IsNullColumnTransformer.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
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package org.apache.iotdb.db.queryengine.transformation.dag.column.unary;

import org.apache.iotdb.db.queryengine.transformation.dag.column.ColumnTransformer;

import org.apache.tsfile.block.column.Column;
import org.apache.tsfile.block.column.ColumnBuilder;
import org.apache.tsfile.read.common.type.Type;

public class IsNullColumnTransformer extends UnaryColumnTransformer {

  private final boolean isNot;

  public IsNullColumnTransformer(
      Type returnType, ColumnTransformer childColumnTransformer, boolean isNot) {
    super(returnType, childColumnTransformer);
    this.isNot = isNot;
  }

  @Override
  protected void doTransform(Column column, ColumnBuilder columnBuilder) {
    for (int i = 0, n = column.getPositionCount(); i < n; i++) {
      returnType.writeBoolean(columnBuilder, column.isNull(i) ^ isNot);
    }
  }
}