org.apache.impala.analysis.CreateTableDataSrcStmt.java Source code

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Here is the source code for org.apache.impala.analysis.CreateTableDataSrcStmt.java

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// Licensed to the Apache Software Foundation (ASF) under one
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// 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
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.impala.analysis;

import static org.apache.impala.catalog.DataSourceTable.TBL_PROP_API_VER;
import static org.apache.impala.catalog.DataSourceTable.TBL_PROP_CLASS;
import static org.apache.impala.catalog.DataSourceTable.TBL_PROP_DATA_SRC_NAME;
import static org.apache.impala.catalog.DataSourceTable.TBL_PROP_INIT_STRING;
import static org.apache.impala.catalog.DataSourceTable.TBL_PROP_LOCATION;

import org.apache.impala.authorization.Privilege;
import org.apache.impala.catalog.DataSource;
import org.apache.impala.catalog.DataSourceTable;
import org.apache.impala.common.AnalysisException;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import org.apache.hadoop.fs.permission.FsAction;

/**
 * Represents a CREATE TABLE statement for external data sources. Such tables
 * reference an external data source (created with a CREATE DATA SOURCE statement)
 * and the properties of that source are stored in the table properties because
 * the metastore does not store the data sources themselves.
 */
public class CreateTableDataSrcStmt extends CreateTableStmt {

    public CreateTableDataSrcStmt(CreateTableStmt createTableStmt, String dataSourceName, String initString) {
        super(createTableStmt);
        Preconditions.checkNotNull(dataSourceName);
        getTblProperties().put(TBL_PROP_DATA_SRC_NAME, dataSourceName.toLowerCase());
        getTblProperties().put(TBL_PROP_INIT_STRING, Strings.nullToEmpty(initString));
    }

    @Override
    public void analyze(Analyzer analyzer) throws AnalysisException {
        super.analyze(analyzer);
        String dataSourceName = getTblProperties().get(TBL_PROP_DATA_SRC_NAME);
        DataSource dataSource = analyzer.getCatalog().getDataSource(dataSourceName);
        if (dataSource == null) {
            throw new AnalysisException("Data source does not exist: " + dataSourceName);
        }

        for (ColumnDef col : getColumnDefs()) {
            if (!DataSourceTable.isSupportedColumnType(col.getType())) {
                throw new AnalysisException("Tables produced by an external data source do "
                        + "not support the column type: " + col.getType());
            }
        }
        // Add table properties from the DataSource catalog object now that we have access
        // to the catalog. These are stored in the table metadata because DataSource catalog
        // objects are not currently persisted.
        String location = dataSource.getLocation();
        getTblProperties().put(TBL_PROP_LOCATION, location);
        getTblProperties().put(TBL_PROP_CLASS, dataSource.getClassName());
        getTblProperties().put(TBL_PROP_API_VER, dataSource.getApiVersion());
        new HdfsUri(location).analyze(analyzer, Privilege.ALL, FsAction.READ);
        // TODO: check class exists and implements API version
    }
}