Method main

java/examples/src/java/org/apache/orc/examples/CoreReader.java:34–64

(Configuration conf, String[] args)

public class CoreReader {
  public static void main(Configuration conf, String[] args) throws IOException {
    // Get the information from the file footer
    Reader reader = OrcFile.createReader(new Path("my-file.orc"),
                                         OrcFile.readerOptions(conf));
    System.out.println("File schema: " + reader.getSchema());
    System.out.println("Row count: " + reader.getNumberOfRows());

    // Pick the schema we want to read using schema evolution
    TypeDescription readSchema =
        TypeDescription.fromString("struct<z:int,y:string,x:bigint>");
    // Read the row data
    VectorizedRowBatch batch = readSchema.createRowBatch();
    RecordReader rowIterator = reader.rows(reader.options()
                                             .schema(readSchema));
    LongColumnVector z = (LongColumnVector) batch.cols[0];
    BytesColumnVector y = (BytesColumnVector) batch.cols[1];
    LongColumnVector x = (LongColumnVector) batch.cols[2];
    while (rowIterator.nextBatch(batch)) {
      for(int row=0; row < batch.size; ++row) {
        int zRow = z.isRepeating ? 0: row;
        int xRow = x.isRepeating ? 0: row;
        System.out.println("z: " +
            (z.noNulls || !z.isNull[zRow] ? z.vector[zRow] : null));
        System.out.println("y: " + y.toString(row));
        System.out.println("x: " +
            (x.noNulls || !x.isNull[xRow] ? x.vector[xRow] : null));
      }
    }
    rowIterator.close();
    reader.close();
  }

  public static void main(String[] args) throws IOException {
    main(new Configuration(), args);