public ParquetRecordReader(
FragmentContext fragmentContext,
long batchSize,
long numRecordsToRead,
String path,
int rowGroupIndex,
FileSystem fs,
CodecFactory codecFactory,
ParquetMetadata footer,
List<SchemaPath> columns,
ParquetReaderUtility.DateCorruptionStatus dateCorruptionStatus)
throws ExecutionSetupException {
this.hadoopPath = new Path(path);
this.fileSystem = fs;
this.codecFactory = codecFactory;
this.rowGroupIndex = rowGroupIndex;
this.batchSize = batchSize;
this.footer = footer;
this.dateCorruptionStatus = dateCorruptionStatus;
this.fragmentContext = fragmentContext;
// Callers can pass -1 if they want to read all rows.
if (numRecordsToRead == NUM_RECORDS_TO_READ_NOT_SPECIFIED) {
this.numRecordsToRead = footer.getBlocks().get(rowGroupIndex).getRowCount();
} else {
assert (numRecordsToRead >= 0);
this.numRecordsToRead =
Math.min(numRecordsToRead, footer.getBlocks().get(rowGroupIndex).getRowCount());
}
setColumns(columns);
}
public ParquetRecordReader(
FragmentContext fragmentContext,
String path,
int rowGroupIndex,
FileSystem fs,
CodecFactory codecFactory,
ParquetMetadata footer,
List<SchemaPath> columns,
ParquetReaderUtility.DateCorruptionStatus dateCorruptionStatus)
throws ExecutionSetupException {
this(
fragmentContext,
DEFAULT_BATCH_LENGTH_IN_BITS,
footer.getBlocks().get(rowGroupIndex).getRowCount(),
path,
rowGroupIndex,
fs,
codecFactory,
footer,
columns,
dateCorruptionStatus);
}
@Override
public int next() {
resetBatch();
long recordsToRead = 0;
try {
ColumnReader<?> firstColumnStatus;
if (columnStatuses.size() > 0) {
firstColumnStatus = columnStatuses.iterator().next();
} else {
if (varLengthReader.columns.size() > 0) {
firstColumnStatus = varLengthReader.columns.iterator().next();
} else {
firstColumnStatus = null;
}
}
// No columns found in the file were selected, simply return a full batch of null records for
// each column requested
if (firstColumnStatus == null) {
if (mockRecordsRead == footer.getBlocks().get(rowGroupIndex).getRowCount()) {
updateStats();
return 0;
}
recordsToRead =
Math.min(
DEFAULT_RECORDS_TO_READ_IF_NOT_FIXED_WIDTH,
footer.getBlocks().get(rowGroupIndex).getRowCount() - mockRecordsRead);
// Pick the minimum of recordsToRead calculated above and numRecordsToRead (based on
// rowCount and limit).
recordsToRead = Math.min(recordsToRead, numRecordsToRead);
for (final ValueVector vv : nullFilledVectors) {
vv.getMutator().setValueCount((int) recordsToRead);
}
mockRecordsRead += recordsToRead;
totalRecordsRead += recordsToRead;
numRecordsToRead -= recordsToRead;
updateStats();
return (int) recordsToRead;
}
if (allFieldsFixedLength) {
recordsToRead =
Math.min(
recordsPerBatch,
firstColumnStatus.columnChunkMetaData.getValueCount()
- firstColumnStatus.totalValuesRead);
} else {
recordsToRead = DEFAULT_RECORDS_TO_READ_IF_NOT_FIXED_WIDTH;
}
// Pick the minimum of recordsToRead calculated above and numRecordsToRead (based on rowCount
// and limit)
recordsToRead = Math.min(recordsToRead, numRecordsToRead);
if (allFieldsFixedLength) {
readAllFixedFields(recordsToRead);
} else { // variable length columns
long fixedRecordsToRead = varLengthReader.readFields(recordsToRead, firstColumnStatus);
readAllFixedFields(fixedRecordsToRead);
}
// if we have requested columns that were not found in the file fill their vectors with null
// (by simply setting the value counts inside of them, as they start null filled)
if (nullFilledVectors != null) {
for (final ValueVector vv : nullFilledVectors) {
vv.getMutator().setValueCount(firstColumnStatus.getRecordsReadInCurrentPass());
}
}
// logger.debug("So far read {} records out of row group({}) in file '{}'",
// totalRecordsRead, rowGroupIndex, hadoopPath.toUri().getPath());
totalRecordsRead += firstColumnStatus.getRecordsReadInCurrentPass();
numRecordsToRead -= firstColumnStatus.getRecordsReadInCurrentPass();
updateStats();
return firstColumnStatus.getRecordsReadInCurrentPass();
} catch (Exception e) {
handleAndRaise(
"\nHadoop path: "
+ hadoopPath.toUri().getPath()
+ "\nTotal records read: "
+ totalRecordsRead
+ "\nMock records read: "
+ mockRecordsRead
+ "\nRecords to read: "
+ recordsToRead
+ "\nRow group index: "
+ rowGroupIndex
+ "\nRecords in row group: "
+ footer.getBlocks().get(rowGroupIndex).getRowCount(),
e);
}
// this is never reached
return 0;
}
@Override
public void setup(OperatorContext operatorContext, OutputMutator output)
throws ExecutionSetupException {
this.operatorContext = operatorContext;
if (!isStarQuery()) {
columnsFound = new boolean[getColumns().size()];
nullFilledVectors = new ArrayList<>();
}
columnStatuses = new ArrayList<>();
// totalRecords = footer.getBlocks().get(rowGroupIndex).getRowCount();
List<ColumnDescriptor> columns = footer.getFileMetaData().getSchema().getColumns();
allFieldsFixedLength = true;
ColumnDescriptor column;
ColumnChunkMetaData columnChunkMetaData;
int columnsToScan = 0;
mockRecordsRead = 0;
MaterializedField field;
// ParquetMetadataConverter metaConverter = new ParquetMetadataConverter();
FileMetaData fileMetaData;
logger.debug(
"Reading row group({}) with {} records in file {}.",
rowGroupIndex,
footer.getBlocks().get(rowGroupIndex).getRowCount(),
hadoopPath.toUri().getPath());
totalRecordsRead = 0;
// TODO - figure out how to deal with this better once we add nested reading, note also look
// where this map is used below
// store a map from column name to converted types if they are non-null
Map<String, SchemaElement> schemaElements =
ParquetReaderUtility.getColNameToSchemaElementMapping(footer);
// loop to add up the length of the fixed width columns and build the schema
for (int i = 0; i < columns.size(); ++i) {
column = columns.get(i);
SchemaElement se = schemaElements.get(column.getPath()[0]);
MajorType mt =
ParquetToDrillTypeConverter.toMajorType(
column.getType(),
se.getType_length(),
getDataMode(column),
se,
fragmentContext.getOptions());
field = MaterializedField.create(toFieldName(column.getPath()), mt);
if (!fieldSelected(field)) {
continue;
}
columnsToScan++;
int dataTypeLength = getDataTypeLength(column, se);
if (dataTypeLength == -1) {
allFieldsFixedLength = false;
} else {
bitWidthAllFixedFields += dataTypeLength;
}
}
// rowGroupOffset =
// footer.getBlocks().get(rowGroupIndex).getColumns().get(0).getFirstDataPageOffset();
if (columnsToScan != 0 && allFieldsFixedLength) {
recordsPerBatch =
(int)
Math.min(
Math.min(
batchSize / bitWidthAllFixedFields,
footer.getBlocks().get(0).getColumns().get(0).getValueCount()),
65535);
} else {
recordsPerBatch = DEFAULT_RECORDS_TO_READ_IF_NOT_FIXED_WIDTH;
}
try {
ValueVector vector;
SchemaElement schemaElement;
final ArrayList<VarLengthColumn<? extends ValueVector>> varLengthColumns = new ArrayList<>();
// initialize all of the column read status objects
boolean fieldFixedLength;
// the column chunk meta-data is not guaranteed to be in the same order as the columns in the
// schema
// a map is constructed for fast access to the correct columnChunkMetadata to correspond
// to an element in the schema
Map<String, Integer> columnChunkMetadataPositionsInList = new HashMap<>();
BlockMetaData rowGroupMetadata = footer.getBlocks().get(rowGroupIndex);
int colChunkIndex = 0;
for (ColumnChunkMetaData colChunk : rowGroupMetadata.getColumns()) {
columnChunkMetadataPositionsInList.put(
Arrays.toString(colChunk.getPath().toArray()), colChunkIndex);
colChunkIndex++;
}
for (int i = 0; i < columns.size(); ++i) {
column = columns.get(i);
columnChunkMetaData =
rowGroupMetadata
.getColumns()
.get(columnChunkMetadataPositionsInList.get(Arrays.toString(column.getPath())));
schemaElement = schemaElements.get(column.getPath()[0]);
MajorType type =
ParquetToDrillTypeConverter.toMajorType(
column.getType(),
schemaElement.getType_length(),
getDataMode(column),
schemaElement,
fragmentContext.getOptions());
field = MaterializedField.create(toFieldName(column.getPath()), type);
// the field was not requested to be read
if (!fieldSelected(field)) {
continue;
}
fieldFixedLength = column.getType() != PrimitiveType.PrimitiveTypeName.BINARY;
vector =
output.addField(
field,
(Class<? extends ValueVector>)
TypeHelper.getValueVectorClass(type.getMinorType(), type.getMode()));
if (column.getType() != PrimitiveType.PrimitiveTypeName.BINARY) {
if (column.getMaxRepetitionLevel() > 0) {
final RepeatedValueVector repeatedVector = RepeatedValueVector.class.cast(vector);
ColumnReader<?> dataReader =
ColumnReaderFactory.createFixedColumnReader(
this,
fieldFixedLength,
column,
columnChunkMetaData,
recordsPerBatch,
repeatedVector.getDataVector(),
schemaElement);
varLengthColumns.add(
new FixedWidthRepeatedReader(
this,
dataReader,
getTypeLengthInBits(column.getType()),
-1,
column,
columnChunkMetaData,
false,
repeatedVector,
schemaElement));
} else {
columnStatuses.add(
ColumnReaderFactory.createFixedColumnReader(
this,
fieldFixedLength,
column,
columnChunkMetaData,
recordsPerBatch,
vector,
schemaElement));
}
} else {
// create a reader and add it to the appropriate list
varLengthColumns.add(
ColumnReaderFactory.getReader(
this, -1, column, columnChunkMetaData, false, vector, schemaElement));
}
}
varLengthReader = new VarLenBinaryReader(this, varLengthColumns);
if (!isStarQuery()) {
List<SchemaPath> projectedColumns = Lists.newArrayList(getColumns());
SchemaPath col;
for (int i = 0; i < columnsFound.length; i++) {
col = projectedColumns.get(i);
assert col != null;
if (!columnsFound[i] && !col.equals(STAR_COLUMN)) {
nullFilledVectors.add(
(NullableIntVector)
output.addField(
MaterializedField.create(
col.getAsUnescapedPath(), Types.optional(TypeProtos.MinorType.INT)),
(Class<? extends ValueVector>)
TypeHelper.getValueVectorClass(
TypeProtos.MinorType.INT, DataMode.OPTIONAL)));
}
}
}
} catch (Exception e) {
handleAndRaise("Failure in setting up reader", e);
}
}