BaseTableRef.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 com.cloudera.impala.common.AnalysisException;
import com.google.common.base.Preconditions;

public class BaseTableRef extends TableRef {
  public BaseTableRef(TableRef tableRef, Path resolvedPath) {
    super(tableRef);
    resolvedPath_ = resolvedPath;
    Preconditions.checkState(resolvedPath_.isResolved());
    Preconditions.checkNotNull(resolvedPath_.getRootTable());
    // Set implicit aliases if no explicit one was given.
    if (hasExplicitAlias()) return;
    aliases_ = new String[] {
        getTable().getTableName().toString().toLowerCase(),
        getTable().getName().toLowerCase() };
  }

  private BaseTableRef(BaseTableRef other) {
    super(other);
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    Preconditions.checkNotNull(getPrivilegeRequirement());
    desc_ = analyzer.registerTableRef(this);
    isAnalyzed_ = true;
    analyzeJoin(analyzer);
  }

  @Override
  protected String tableRefToSql() {
    // Enclose the alias in quotes if Hive cannot parse it without quotes.
    // This is needed for view compatibility between Impala and Hive.
    String aliasSql = null;
    String alias = getExplicitAlias();
    if (alias != null) aliasSql = ToSqlUtils.getIdentSql(alias);
    return getTable().getTableName().toSql() +
        ((aliasSql != null) ? " " + aliasSql : "");
  }

  public String debugString() { return tableRefToSql(); }
  @Override
  public TableRef clone() { return new BaseTableRef(this); }
}