fe/src/main/java/org/apache/impala/analysis/DescribeHistoryStmt.java

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.impala.analysis;

import java.util.List;

import org.apache.impala.authorization.Privilege;
import org.apache.impala.catalog.FeIcebergTable;
import org.apache.impala.catalog.FeTable;
import org.apache.impala.common.AnalysisException;
import org.apache.impala.thrift.TDescribeHistoryParams;

import com.google.common.base.Preconditions;

/**
 * Representation of a DESCRIBE HISTORY statement.
 */
public class DescribeHistoryStmt extends StatementBase {
  protected final TableName tableName_;

  // Set during analysis.
  protected FeTable table_;

  public DescribeHistoryStmt(TableName tableName) {
    tableName_ = Preconditions.checkNotNull(tableName);
  }

  @Override
  public String toSql(ToSqlOptions options) {
    return "DESCRIBE HISTORY " + tableName_.toString();
  }

  @Override
  public void collectTableRefs(List<TableRef> tblRefs) {
    tblRefs.add(new TableRef(tableName_.toPath(), null));
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    table_ = analyzer.getTable(tableName_, Privilege.VIEW_METADATA);
    Preconditions.checkNotNull(table_);
    if (!(table_ instanceof FeIcebergTable)) {
      throw new AnalysisException(String.format(
          "DESCRIBE HISTORY must specify an Iceberg table: %s", table_.getFullName()));
    }
  }

  public TDescribeHistoryParams toThrift() {
    return new TDescribeHistoryParams(new TableName(table_.getDb().getName(),
        table_.getName()).toThrift());
  }
}