spark TableSchema 源码

spark TableSchema 代码

文件路径：/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/TableSchema.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.hive.service.cli;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.Schema;
import org.apache.hadoop.hive.serde2.thrift.Type;
import org.apache.hive.service.rpc.thrift.TColumnDesc;
import org.apache.hive.service.rpc.thrift.TTableSchema;

/**
 * TableSchema.
 *
 */
public class TableSchema {
  private final List<ColumnDescriptor> columns = new ArrayList<ColumnDescriptor>();

  public TableSchema() {
  }

  public TableSchema(int numColumns) {
    // TODO: remove this constructor
  }

  public TableSchema(TTableSchema tTableSchema) {
    for (TColumnDesc tColumnDesc : tTableSchema.getColumns()) {
      columns.add(new ColumnDescriptor(tColumnDesc));
    }
  }

  public TableSchema(List<FieldSchema> fieldSchemas) {
    int pos = 1;
    for (FieldSchema field : fieldSchemas) {
      columns.add(new ColumnDescriptor(field.getName(), field.getComment(),
          new TypeDescriptor(field.getType()), pos++));
    }
  }

  public TableSchema(Schema schema) {
    this(schema.getFieldSchemas());
  }

  public List<ColumnDescriptor> getColumnDescriptors() {
    return new ArrayList<ColumnDescriptor>(columns);
  }

  public ColumnDescriptor getColumnDescriptorAt(int pos) {
    return columns.get(pos);
  }

  public int getSize() {
    return columns.size();
  }

  public void clear() {
    columns.clear();
  }


  public TTableSchema toTTableSchema() {
    TTableSchema tTableSchema = new TTableSchema();
    for (ColumnDescriptor col : columns) {
      tTableSchema.addToColumns(col.toTColumnDesc());
    }
    return tTableSchema;
  }

  public TypeDescriptor[] toTypeDescriptors() {
    TypeDescriptor[] types = new TypeDescriptor[columns.size()];
    for (int i = 0; i < types.length; i++) {
      types[i] = columns.get(i).getTypeDescriptor();
    }
    return types;
  }

  public TableSchema addPrimitiveColumn(String columnName, Type columnType, String columnComment) {
    columns.add(ColumnDescriptor.newPrimitiveColumnDescriptor(columnName, columnComment, columnType, columns.size() + 1));
    return this;
  }

  public TableSchema addStringColumn(String columnName, String columnComment) {
    columns.add(ColumnDescriptor.newPrimitiveColumnDescriptor(columnName, columnComment, Type.STRING_TYPE, columns.size() + 1));
    return this;
  }
}

相关信息

spark 源码目录

相关文章

spark CLIService 源码

spark CLIServiceClient 源码

spark CLIServiceUtils 源码

spark ColumnBasedSet 源码

spark ColumnDescriptor 源码

spark ColumnValue 源码

spark FetchOrientation 源码

spark FetchType 源码

spark GetInfoType 源码

spark GetInfoValue 源码