/*
* This is the same as the setChildren method below but for empty tables.
* It takes care of the following:
* 1. Create the right object inspector.
* 2. Set up the childrenOpToOI with the object inspector.
* So as to ensure that the initialization happens correctly.
*/
public void initEmptyInputChildren(List<Operator<?>> children, Configuration hconf)
throws SerDeException, Exception {
setChildOperators(children);
for (Operator<?> child : children) {
TableScanOperator tsOp = (TableScanOperator) child;
StructObjectInspector soi = null;
PartitionDesc partDesc = conf.getAliasToPartnInfo().get(tsOp.getConf().getAlias());
Deserializer serde = partDesc.getTableDesc().getDeserializer();
partDesc.setProperties(partDesc.getProperties());
MapOpCtx opCtx = new MapOpCtx(tsOp.getConf().getAlias(), child, partDesc);
StructObjectInspector tableRowOI = (StructObjectInspector) serde.getObjectInspector();
initObjectInspector(hconf, opCtx, tableRowOI);
soi = opCtx.rowObjectInspector;
child.getParentOperators().add(this);
childrenOpToOI.put(child, soi);
}
}
private MapOpCtx initObjectInspector(
Configuration hconf, MapOpCtx opCtx, StructObjectInspector tableRowOI) throws Exception {
PartitionDesc pd = opCtx.partDesc;
TableDesc td = pd.getTableDesc();
// Use table properties in case of unpartitioned tables,
// and the union of table properties and partition properties, with partition
// taking precedence, in the case of partitioned tables
Properties overlayedProps =
SerDeUtils.createOverlayedProperties(td.getProperties(), pd.getProperties());
Map<String, String> partSpec = pd.getPartSpec();
opCtx.tableName = String.valueOf(overlayedProps.getProperty("name"));
opCtx.partName = String.valueOf(partSpec);
opCtx.deserializer = pd.getDeserializer(hconf);
StructObjectInspector partRawRowObjectInspector;
if (Utilities.isInputFileFormatSelfDescribing(pd)) {
partRawRowObjectInspector = tableRowOI;
} else {
partRawRowObjectInspector = (StructObjectInspector) opCtx.deserializer.getObjectInspector();
}
opCtx.partTblObjectInspectorConverter =
ObjectInspectorConverters.getConverter(partRawRowObjectInspector, tableRowOI);
// Next check if this table has partitions and if so
// get the list of partition names as well as allocate
// the serdes for the partition columns
String pcols = overlayedProps.getProperty(hive_metastoreConstants.META_TABLE_PARTITION_COLUMNS);
if (pcols != null && pcols.length() > 0) {
String[] partKeys = pcols.trim().split("/");
String pcolTypes =
overlayedProps.getProperty(hive_metastoreConstants.META_TABLE_PARTITION_COLUMN_TYPES);
String[] partKeyTypes = pcolTypes.trim().split(":");
if (partKeys.length > partKeyTypes.length) {
throw new HiveException(
"Internal error : partKeys length, "
+ partKeys.length
+ " greater than partKeyTypes length, "
+ partKeyTypes.length);
}
List<String> partNames = new ArrayList<String>(partKeys.length);
Object[] partValues = new Object[partKeys.length];
List<ObjectInspector> partObjectInspectors = new ArrayList<ObjectInspector>(partKeys.length);
for (int i = 0; i < partKeys.length; i++) {
String key = partKeys[i];
partNames.add(key);
ObjectInspector oi =
PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(
TypeInfoFactory.getPrimitiveTypeInfo(partKeyTypes[i]));
// Partitions do not exist for this table
if (partSpec == null) {
// for partitionless table, initialize partValue to null
partValues[i] = null;
} else {
partValues[i] =
ObjectInspectorConverters.getConverter(
PrimitiveObjectInspectorFactory.javaStringObjectInspector, oi)
.convert(partSpec.get(key));
}
partObjectInspectors.add(oi);
}
opCtx.rowWithPart = new Object[] {null, partValues};
opCtx.partObjectInspector =
ObjectInspectorFactory.getStandardStructObjectInspector(partNames, partObjectInspectors);
}
// The op may not be a TableScan for mapjoins
// Consider the query: select /*+MAPJOIN(a)*/ count(*) FROM T1 a JOIN T2 b ON a.key = b.key;
// In that case, it will be a Select, but the rowOI need not be amended
if (opCtx.op instanceof TableScanOperator) {
TableScanOperator tsOp = (TableScanOperator) opCtx.op;
TableScanDesc tsDesc = tsOp.getConf();
if (tsDesc != null && tsDesc.hasVirtualCols()) {
opCtx.vcs = tsDesc.getVirtualCols();
opCtx.vcValues = new Object[opCtx.vcs.size()];
opCtx.vcsObjectInspector = VirtualColumn.getVCSObjectInspector(opCtx.vcs);
if (opCtx.isPartitioned()) {
opCtx.rowWithPartAndVC = Arrays.copyOfRange(opCtx.rowWithPart, 0, 3);
} else {
opCtx.rowWithPartAndVC = new Object[2];
}
}
}
if (!opCtx.hasVC() && !opCtx.isPartitioned()) {
opCtx.rowObjectInspector = tableRowOI;
return opCtx;
}
List<StructObjectInspector> inspectors = new ArrayList<StructObjectInspector>();
inspectors.add(tableRowOI);
if (opCtx.isPartitioned()) {
inspectors.add(opCtx.partObjectInspector);
}
if (opCtx.hasVC()) {
inspectors.add(opCtx.vcsObjectInspector);
}
opCtx.rowObjectInspector = ObjectInspectorFactory.getUnionStructObjectInspector(inspectors);
return opCtx;
}