public void printFileInfo() throws Exception { System.out.println("Reader: " + m_reader); System.out.println("# Rows: " + m_reader.getNumberOfRows()); System.out.println("# Types in the file: " + m_types.size()); for (int i = 0; i < m_types.size(); i++) { System.out.println("Type " + i + ": " + m_types.get(i).getKind()); } System.out.println("Compression: " + m_reader.getCompression()); if (m_reader.getCompression() != CompressionKind.NONE) { System.out.println("Compression size: " + m_reader.getCompressionSize()); } m_oi = (StructObjectInspector) m_reader.getObjectInspector(); System.out.println("object inspector type category: " + m_oi.getCategory()); System.out.println("object inspector type name : " + m_oi.getTypeName()); System.out.println("Number of columns in the table: " + m_fields.size()); // Print the type info: for (int i = 0; i < m_fields.size(); i++) { System.out.println("Column " + i + " name: " + m_fields.get(i).getFieldName()); ObjectInspector lv_foi = m_fields.get(i).getFieldObjectInspector(); System.out.println("Column " + i + " type category: " + lv_foi.getCategory()); System.out.println("Column " + i + " type name: " + lv_foi.getTypeName()); } }
// This method is just for experimentation. public void testRead() throws Exception { m_reader = OrcFile.createReader(m_file_path, OrcFile.readerOptions(m_conf)); System.out.println("Reader: " + m_reader); System.out.println("# Rows: " + m_reader.getNumberOfRows()); m_types = m_reader.getTypes(); System.out.println("# Types in the file: " + m_types.size()); for (int i = 0; i < m_types.size(); i++) { System.out.println("Type " + i + ": " + m_types.get(i).getKind()); } System.out.println("Compression: " + m_reader.getCompression()); if (m_reader.getCompression() != CompressionKind.NONE) { System.out.println("Compression size: " + m_reader.getCompressionSize()); } StructObjectInspector m_oi = (StructObjectInspector) m_reader.getObjectInspector(); System.out.println("object inspector type category: " + m_oi.getCategory()); System.out.println("object inspector type name : " + m_oi.getTypeName()); m_fields = m_oi.getAllStructFieldRefs(); System.out.println("Number of columns in the table: " + m_fields.size()); RecordReader m_rr = m_reader.rows(); // Print the type info: for (int i = 0; i < m_fields.size(); i++) { System.out.println("Column " + i + " name: " + m_fields.get(i).getFieldName()); ObjectInspector lv_foi = m_fields.get(i).getFieldObjectInspector(); System.out.println("Column " + i + " type category: " + lv_foi.getCategory()); System.out.println("Column " + i + " type name: " + lv_foi.getTypeName()); // Object lv_column_val = m_oi.getStructFieldData(lv_row, m_fields.get(i)); // System.out.print("Column " + i + " value: " + lv_row.getFieldValue(i)); } OrcStruct lv_row = null; Object lv_field_val = null; StringBuilder lv_row_string = new StringBuilder(1024); while (m_rr.hasNext()) { lv_row = (OrcStruct) m_rr.next(lv_row); lv_row_string.setLength(0); for (int i = 0; i < m_fields.size(); i++) { lv_field_val = lv_row.getFieldValue(i); if (lv_field_val != null) { lv_row_string.append(lv_field_val); } lv_row_string.append('|'); } System.out.println(lv_row_string); } /** * Typecasting to appropriate type based on the 'kind' if (OrcProto.Type.Kind.INT == * m_types.get(1).getKind()) { IntWritable lvf_1_val = (IntWritable) lv_row.getFieldValue(0); * System.out.println("Column 1 value: " + lvf_1_val); } */ }