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

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.impala.analysis;

import com.google.common.base.Preconditions;
import com.google.common.base.Joiner;

import org.apache.impala.catalog.FeKuduTable;
import org.apache.impala.catalog.FeTable;
import org.apache.impala.common.AnalysisException;
import org.apache.impala.thrift.TAlterTableAddPartitionParams;
import org.apache.impala.thrift.TAlterTableParams;
import org.apache.impala.thrift.TAlterTableType;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Represents an ALTER TABLE ADD PARTITION statement.
 */
public class AlterTableAddPartitionStmt extends AlterTableStmt {
  private final boolean ifNotExists_;
  private final List<PartitionDef> partitions_;

  public AlterTableAddPartitionStmt(TableName tableName,
      boolean ifNotExists, List<PartitionDef> partitions) {
    super(tableName);
    Preconditions.checkNotNull(partitions);
    Preconditions.checkState(!partitions.isEmpty());
    partitions_ = partitions;
    // If 'ifNotExists' is true, no error is raised if a partition with the same spec
    // already exists. If multiple partitions are specified, the statement will ignore
    // those that exist and add the rest.
    ifNotExists_ = ifNotExists;
    for (PartitionDef p: partitions_) {
      p.setTableName(tableName);
      if (!ifNotExists_) p.setPartitionShouldNotExist();
    }
  }

  public boolean getIfNotExists() { return ifNotExists_; }

  @Override
  public String toSql(ToSqlOptions options) {
    StringBuilder sb = new StringBuilder("ALTER TABLE ");
    if (getDb() != null) sb.append(getDb() + ".");
    sb.append(getTbl()).append(" ADD");
    if (ifNotExists_) sb.append(" IF NOT EXISTS");
    for (PartitionDef p : partitions_) sb.append(" " + p.toSql(options));
    return sb.toString();
  }

  @Override
  public TAlterTableParams toThrift() {
    TAlterTableAddPartitionParams addPartParams = new TAlterTableAddPartitionParams();
    addPartParams.setIf_not_exists(ifNotExists_);
    for (PartitionDef p: partitions_) addPartParams.addToPartitions(p.toThrift());
    TAlterTableParams params = super.toThrift();
    params.setAlter_type(TAlterTableType.ADD_PARTITION);
    params.setAdd_partition_params(addPartParams);
    return params;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    super.analyze(analyzer);
    FeTable table = getTargetTable();
    if (table instanceof FeKuduTable) {
      throw new AnalysisException("ALTER TABLE ADD PARTITION is not supported for " +
          "Kudu tables: " + table.getTableName());
    }
    Set<String> partitionSpecs = new HashSet<>();
    for (PartitionDef p: partitions_) {
      p.analyze(analyzer);

      // Make sure no duplicate partition specs are specified
      if (!partitionSpecs.add(p.getPartitionSpec().toCanonicalString())) {
        throw new AnalysisException(String.format("Duplicate partition spec: (%s)",
            Joiner.on(", ").join(p.getPartitionSpec().getPartitionSpecKeyValues())));
      }
    }
  }
}