public int run()

in parquet-cli/src/main/java/org/apache/parquet/cli/commands/ShowColumnIndexCommand.java [82:135]
51 lines of code
14 McCabe index (conditional complexity)

  public int run() throws IOException {
    Preconditions.checkArgument(files != null && files.size() >= 1, "A Parquet file is required.");
    Preconditions.checkArgument(files.size() == 1, "Cannot process multiple Parquet files.");

    InputFile in = HadoopInputFile.fromPath(qualifiedPath(files.get(0)), getConf());
    if (!showColumnIndex && !showOffsetIndex) {
      showColumnIndex = true;
      showOffsetIndex = true;
    }

    Set<String> rowGroupIndexSet = new HashSet<>();
    if (rowGroupIndexes != null) {
      rowGroupIndexSet.addAll(rowGroupIndexes);
    }

    try (ParquetFileReader reader = ParquetFileReader.open(in)) {
      boolean firstBlock = true;
      int rowGroupIndex = 0;
      for (BlockMetaData block : reader.getFooter().getBlocks()) {
        if (!rowGroupIndexSet.isEmpty() && !rowGroupIndexSet.contains(Integer.toString(rowGroupIndex))) {
          ++rowGroupIndex;
          continue;
        }
        if (!firstBlock) {
          console.info("");
        }
        firstBlock = false;
        console.info("row-group {}:", rowGroupIndex);
        for (ColumnChunkMetaData column : getColumns(block)) {
          String path = column.getPath().toDotString();
          if (showColumnIndex) {
            console.info("column index for column {}:", path);
            ColumnIndex columnIndex = reader.readColumnIndex(column);
            if (columnIndex == null) {
              console.info("NONE");
            } else {
              console.info(columnIndex.toString());
            }
          }
          if (showOffsetIndex) {
            console.info("offset index for column {}:", path);
            OffsetIndex offsetIndex = reader.readOffsetIndex(column);
            if (offsetIndex == null) {
              console.info("NONE");
            } else {
              console.info(offsetIndex.toString());
            }
          }
        }
        ++rowGroupIndex;
      }
    }
    return 0;
  }