public int openFile() throws Exception {
m_reader = OrcFile.createReader(m_file_path, OrcFile.readerOptions(m_conf));
m_types = m_reader.getTypes();
m_oi = (StructObjectInspector) m_reader.getObjectInspector();
m_fields = m_oi.getAllStructFieldRefs();
m_rr = m_reader.rows();
return 0;
}
// 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); }
*/
}