CreateTableLikeStmt.java

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// Copyright 2012 Cloudera Inc.
//
// 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 com.cloudera.impala.analysis;

import org.apache.hadoop.fs.permission.FsAction;

import com.cloudera.impala.authorization.Privilege;
import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TAccessEvent;
import com.cloudera.impala.thrift.TCatalogObjectType;
import com.cloudera.impala.thrift.TCreateTableLikeParams;
import com.cloudera.impala.thrift.THdfsFileFormat;
import com.cloudera.impala.thrift.TTableName;
import com.google.common.base.Preconditions;

public class CreateTableLikeStmt extends StatementBase {
  private final TableName tableName_;
  private final TableName srcTableName_;
  private final boolean isExternal_;
  private final String comment_;
  private final THdfsFileFormat fileFormat_;
  private final HdfsUri location_;
  private final boolean ifNotExists_;

  // Set during analysis
  private String dbName_;
  private String srcDbName_;
  private String owner_;

  public CreateTableLikeStmt(TableName tableName, TableName srcTableName,
      boolean isExternal, String comment, THdfsFileFormat fileFormat, HdfsUri location,
      boolean ifNotExists) {
    Preconditions.checkNotNull(tableName);
    Preconditions.checkNotNull(srcTableName);
    this.tableName_ = tableName;
    this.srcTableName_ = srcTableName;
    this.isExternal_ = isExternal;
    this.comment_ = comment;
    this.fileFormat_ = fileFormat;
    this.location_ = location;
    this.ifNotExists_ = ifNotExists;
  }

  public String getTbl() { return tableName_.getTbl(); }
  public String getSrcTbl() { return srcTableName_.getTbl(); }
  public boolean isExternal() { return isExternal_; }
  public boolean getIfNotExists() { return ifNotExists_; }
  public String getComment() { return comment_; }
  public THdfsFileFormat getFileFormat() { return fileFormat_; }
  public HdfsUri getLocation() { return location_; }

  public String getDb() {
    Preconditions.checkNotNull(dbName_);
    return dbName_;
  }

  public String getSrcDb() {
    Preconditions.checkNotNull(srcDbName_);
    return srcDbName_;
  }

  public String getOwner() {
    Preconditions.checkNotNull(owner_);
    return owner_;
  }

  @Override
  public String toSql() {
    StringBuilder sb = new StringBuilder("CREATE ");
    if (isExternal_) sb.append("EXTERNAL ");
    sb.append("TABLE ");
    if (ifNotExists_) sb.append("IF NOT EXISTS ");
    if (tableName_.getDb() != null) sb.append(tableName_.getDb() + ".");
    sb.append(tableName_.getTbl() + " LIKE ");
    if (srcTableName_.getDb() != null) sb.append(srcTableName_.getDb() + ".");
    sb.append(srcTableName_.getTbl());
    if (comment_ != null) sb.append(" COMMENT '" + comment_ + "'");
    if (fileFormat_ != null) sb.append(" STORED AS " + fileFormat_);
    if (location_ != null) sb.append(" LOCATION '" + location_ + "'");
    return sb.toString();
  }

  public TCreateTableLikeParams toThrift() {
    TCreateTableLikeParams params = new TCreateTableLikeParams();
    params.setTable_name(new TTableName(getDb(), getTbl()));
    params.setSrc_table_name(new TTableName(getSrcDb(), getSrcTbl()));
    params.setOwner(getOwner());
    params.setIs_external(isExternal());
    params.setComment(comment_);
    if (fileFormat_ != null) params.setFile_format(fileFormat_);
    params.setLocation(location_ == null ? null : location_.toString());
    params.setIf_not_exists(getIfNotExists());
    return params;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    Preconditions.checkState(tableName_ != null && !tableName_.isEmpty());
    Preconditions.checkState(srcTableName_ != null && !srcTableName_.isEmpty());
    // Make sure the source table exists and the user has permission to access it.
    srcDbName_ = analyzer
        .getTable(srcTableName_, Privilege.VIEW_METADATA)
        .getDb().getName();
    tableName_.analyze();
    dbName_ = analyzer.getTargetDbName(tableName_);
    owner_ = analyzer.getUser().getName();

    if (analyzer.dbContainsTable(dbName_, tableName_.getTbl(), Privilege.CREATE) &&
        !ifNotExists_) {
      throw new AnalysisException(Analyzer.TBL_ALREADY_EXISTS_ERROR_MSG +
          String.format("%s.%s", dbName_, getTbl()));
    }
    analyzer.addAccessEvent(new TAccessEvent(dbName_ + "." + tableName_.getTbl(),
        TCatalogObjectType.TABLE, Privilege.CREATE.toString()));

    if (location_ != null) {
      location_.analyze(analyzer, Privilege.ALL, FsAction.READ_WRITE);
    }
  }
}