Task<? extends Serializable> child =
children != null && children.size() == 1 ? children.get(0) : null;
Path baseTmpDir = parseCtx.getContext().getMRTmpPath();
JoinDesc joinDescriptor = joinOp.getConf();
Map<Byte, List<ExprNodeDesc>> joinValues = joinDescriptor.getExprs();
int numAliases = joinValues.size();
Map<Byte, Path> bigKeysDirMap = new HashMap<Byte, Path>();
Map<Byte, Map<Byte, Path>> smallKeysDirMap = new HashMap<Byte, Map<Byte, Path>>();
Map<Byte, Path> skewJoinJobResultsDir = new HashMap<Byte, Path>();
Byte[] tags = joinDescriptor.getTagOrder();
for (int i = 0; i < numAliases; i++) {
Byte alias = tags[i];
bigKeysDirMap.put(alias, getBigKeysDir(baseTmpDir, alias));
Map<Byte, Path> smallKeysMap = new HashMap<Byte, Path>();
smallKeysDirMap.put(alias, smallKeysMap);
for (Byte src2 : tags) {
if (!src2.equals(alias)) {
smallKeysMap.put(src2, getSmallKeysDir(baseTmpDir, alias, src2));
}
}
skewJoinJobResultsDir.put(alias, getBigKeysSkewJoinResultDir(baseTmpDir,
alias));
}
joinDescriptor.setHandleSkewJoin(true);
joinDescriptor.setBigKeysDirMap(bigKeysDirMap);
joinDescriptor.setSmallKeysDirMap(smallKeysDirMap);
joinDescriptor.setSkewKeyDefinition(HiveConf.getIntVar(parseCtx.getConf(),
HiveConf.ConfVars.HIVESKEWJOINKEY));
HashMap<Path, Task<? extends Serializable>> bigKeysDirToTaskMap =
new HashMap<Path, Task<? extends Serializable>>();
List<Serializable> listWorks = new ArrayList<Serializable>();
List<Task<? extends Serializable>> listTasks = new ArrayList<Task<? extends Serializable>>();
MapredWork currPlan = (MapredWork) currTask.getWork();
TableDesc keyTblDesc = (TableDesc) currPlan.getReduceWork().getKeyDesc().clone();
List<String> joinKeys = Utilities
.getColumnNames(keyTblDesc.getProperties());
List<String> joinKeyTypes = Utilities.getColumnTypes(keyTblDesc
.getProperties());
Map<Byte, TableDesc> tableDescList = new HashMap<Byte, TableDesc>();
Map<Byte, RowSchema> rowSchemaList = new HashMap<Byte, RowSchema>();
Map<Byte, List<ExprNodeDesc>> newJoinValues = new HashMap<Byte, List<ExprNodeDesc>>();
Map<Byte, List<ExprNodeDesc>> newJoinKeys = new HashMap<Byte, List<ExprNodeDesc>>();
// used for create mapJoinDesc, should be in order
List<TableDesc> newJoinValueTblDesc = new ArrayList<TableDesc>();
for (Byte tag : tags) {
newJoinValueTblDesc.add(null);
}
for (int i = 0; i < numAliases; i++) {
Byte alias = tags[i];
List<ExprNodeDesc> valueCols = joinValues.get(alias);
String colNames = "";
String colTypes = "";
int columnSize = valueCols.size();
List<ExprNodeDesc> newValueExpr = new ArrayList<ExprNodeDesc>();
List<ExprNodeDesc> newKeyExpr = new ArrayList<ExprNodeDesc>();
ArrayList<ColumnInfo> columnInfos = new ArrayList<ColumnInfo>();
boolean first = true;
for (int k = 0; k < columnSize; k++) {
TypeInfo type = valueCols.get(k).getTypeInfo();
String newColName = i + "_VALUE_" + k; // any name, it does not matter.
ColumnInfo columnInfo = new ColumnInfo(newColName, type, alias.toString(), false);
columnInfos.add(columnInfo);
newValueExpr.add(new ExprNodeColumnDesc(columnInfo));
if (!first) {
colNames = colNames + ",";
colTypes = colTypes + ",";
}
first = false;
colNames = colNames + newColName;
colTypes = colTypes + valueCols.get(k).getTypeString();
}
// we are putting join keys at last part of the spilled table
for (int k = 0; k < joinKeys.size(); k++) {
if (!first) {
colNames = colNames + ",";
colTypes = colTypes + ",";
}
first = false;
colNames = colNames + joinKeys.get(k);
colTypes = colTypes + joinKeyTypes.get(k);
ColumnInfo columnInfo = new ColumnInfo(joinKeys.get(k), TypeInfoFactory
.getPrimitiveTypeInfo(joinKeyTypes.get(k)), alias.toString(), false);
columnInfos.add(columnInfo);
newKeyExpr.add(new ExprNodeColumnDesc(columnInfo));
}
newJoinValues.put(alias, newValueExpr);
newJoinKeys.put(alias, newKeyExpr);
tableDescList.put(alias, Utilities.getTableDesc(colNames, colTypes));
rowSchemaList.put(alias, new RowSchema(columnInfos));
// construct value table Desc
String valueColNames = "";
String valueColTypes = "";
first = true;
for (int k = 0; k < columnSize; k++) {
String newColName = i + "_VALUE_" + k; // any name, it does not matter.
if (!first) {
valueColNames = valueColNames + ",";
valueColTypes = valueColTypes + ",";
}
valueColNames = valueColNames + newColName;
valueColTypes = valueColTypes + valueCols.get(k).getTypeString();
first = false;
}
newJoinValueTblDesc.set(Byte.valueOf((byte) i), Utilities.getTableDesc(
valueColNames, valueColTypes));
}
joinDescriptor.setSkewKeysValuesTables(tableDescList);
joinDescriptor.setKeyTableDesc(keyTblDesc);
for (int i = 0; i < numAliases - 1; i++) {
Byte src = tags[i];
MapWork newPlan = PlanUtils.getMapRedWork().getMapWork();
// This code has been only added for testing
boolean mapperCannotSpanPartns =
parseCtx.getConf().getBoolVar(
HiveConf.ConfVars.HIVE_MAPPER_CANNOT_SPAN_MULTIPLE_PARTITIONS);
newPlan.setMapperCannotSpanPartns(mapperCannotSpanPartns);
MapredWork clonePlan = Utilities.clonePlan(currPlan);
Operator<? extends OperatorDesc>[] parentOps = new TableScanOperator[tags.length];
for (int k = 0; k < tags.length; k++) {
Operator<? extends OperatorDesc> ts =
GenMapRedUtils.createTemporaryTableScanOperator(rowSchemaList.get((byte)k));
((TableScanOperator)ts).setTableDesc(tableDescList.get((byte)k));
parentOps[k] = ts;
}
Operator<? extends OperatorDesc> tblScan_op = parentOps[i];
ArrayList<String> aliases = new ArrayList<String>();
String alias = src.toString();
aliases.add(alias);
Path bigKeyDirPath = bigKeysDirMap.get(src);
newPlan.getPathToAliases().put(bigKeyDirPath.toString(), aliases);
newPlan.getAliasToWork().put(alias, tblScan_op);
PartitionDesc part = new PartitionDesc(tableDescList.get(src), null);
newPlan.getPathToPartitionInfo().put(bigKeyDirPath.toString(), part);
newPlan.getAliasToPartnInfo().put(alias, part);
Operator<? extends OperatorDesc> reducer = clonePlan.getReduceWork().getReducer();
assert reducer instanceof JoinOperator;
JoinOperator cloneJoinOp = (JoinOperator) reducer;
String dumpFilePrefix = "mapfile"+PlanUtils.getCountForMapJoinDumpFilePrefix();
MapJoinDesc mapJoinDescriptor = new MapJoinDesc(newJoinKeys, keyTblDesc,
newJoinValues, newJoinValueTblDesc, newJoinValueTblDesc,joinDescriptor
.getOutputColumnNames(), i, joinDescriptor.getConds(),
joinDescriptor.getFilters(), joinDescriptor.getNoOuterJoin(), dumpFilePrefix);
mapJoinDescriptor.setTagOrder(tags);
mapJoinDescriptor.setHandleSkewJoin(false);
mapJoinDescriptor.setNullSafes(joinDescriptor.getNullSafes());
MapredLocalWork localPlan = new MapredLocalWork(
new LinkedHashMap<String, Operator<? extends OperatorDesc>>(),
new LinkedHashMap<String, FetchWork>());
Map<Byte, Path> smallTblDirs = smallKeysDirMap.get(src);