aws-glue-datacatalog-spark-client/src/main/java/com/amazonaws/glue/catalog/metastore/AWSCatalogMetastoreClient.java [579:601]:
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  public boolean dropIndex(String dbName, String tblName, String name, boolean deleteData) throws NoSuchObjectException,
        MetaException, TException {
      Index indexToDrop = getIndex(dbName, tblName, name);
      String indexTableName = indexToDrop.getIndexTableName();

      // Drop the index metadata
      org.apache.hadoop.hive.metastore.api.Table originTable = getTable(dbName, tblName);
      Map<String, String> parameters = originTable.getParameters();
      String indexTableObjectName = INDEX_PREFIX + name;
      if (!parameters.containsKey(indexTableObjectName)) {
          throw new NoSuchObjectException("can not find Index: " + name);
      }
      parameters.remove(indexTableObjectName);

      alter_table(dbName, tblName, originTable);

      // Now drop the data associated with the table used to hold the index data
      if(indexTableName != null && indexTableName.length() > 0) {
          dropTable(dbName, indexTableName, deleteData, true);
      }

      return true;
  }
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aws-glue-datacatalog-hive2-client/src/main/java/com/amazonaws/glue/catalog/metastore/AWSCatalogMetastoreClient.java [680:702]:
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  public boolean dropIndex(String dbName, String tblName, String name, boolean deleteData) throws NoSuchObjectException,
        MetaException, TException {
    Index indexToDrop = getIndex(dbName, tblName, name);
    String indexTableName = indexToDrop.getIndexTableName();

    // Drop the index metadata
    org.apache.hadoop.hive.metastore.api.Table originTable = getTable(dbName, tblName);
    Map<String, String> parameters = originTable.getParameters();
    String indexTableObjectName = INDEX_PREFIX + name;
    if (!parameters.containsKey(indexTableObjectName)) {
      throw new NoSuchObjectException("can not find Index: " + name);
    }
    parameters.remove(indexTableObjectName);

    alter_table(dbName, tblName, originTable);

    // Now drop the data associated with the table used to hold the index data
    if(indexTableName != null && indexTableName.length() > 0) {
      dropTable(dbName, indexTableName, deleteData, true);
    }

    return true;
  }
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