return null;
}
ctx.setCurrUnionOp(union);
UnionParseContext uPrsCtx = uCtx.getUnionParseContext(union);
assert uPrsCtx != null;
Task<? extends Serializable> currTask = ctx.getCurrTask();
int pos = UnionProcFactory.getPositionParent(union, stack);
// is the current task a root task
if (uPrsCtx.getRootTask(pos) && (!ctx.getRootTasks().contains(currTask)))
ctx.getRootTasks().add(currTask);
GenMRUnionCtx uCtxTask = ctx.getUnionTask(union);
Task<? extends Serializable> uTask = null;
pos = UnionProcFactory.getPositionParent(union, stack);
Operator<? extends Serializable> parent = union.getParentOperators().get(pos);
mapredWork uPlan = null;
// union is encountered for the first time
if (uCtxTask == null) {
uCtxTask = new GenMRUnionCtx();
uPlan = GenMapRedUtils.getMapRedWork();
uTask = TaskFactory.get(uPlan, parseCtx.getConf());
uCtxTask.setUTask(uTask);
ctx.setUnionTask(union, uCtxTask);
}
else {
uTask = uCtxTask.getUTask();
uPlan = (mapredWork)uTask.getWork();
}
tableDesc tt_desc =
PlanUtils.getBinaryTableDesc(PlanUtils.getFieldSchemasFromRowSchema(parent.getSchema(), "temporarycol"));
// generate the temporary file
String scratchDir = ctx.getScratchDir();
int randomid = ctx.getRandomId();
int pathid = ctx.getPathId();
String taskTmpDir = (new Path(scratchDir + File.separator + randomid + '.' + pathid)).toString();
pathid++;
ctx.setPathId(pathid);
// Add the path to alias mapping
uCtxTask.addTaskTmpDir(taskTmpDir);
uCtxTask.addTTDesc(tt_desc);
// The union task is empty. The files created for all the inputs are assembled in the
// union context and later used to initialize the union plan
// Create a file sink operator for this file name
Operator<? extends Serializable> fs_op =
OperatorFactory.get
(new fileSinkDesc(taskTmpDir, tt_desc,
parseCtx.getConf().getBoolVar(HiveConf.ConfVars.COMPRESSINTERMEDIATE)),
parent.getSchema());
assert parent.getChildOperators().size() == 1;
parent.getChildOperators().set(0, fs_op);
List<Operator<? extends Serializable>> parentOpList = new ArrayList<Operator<? extends Serializable>>();
parentOpList.add(parent);
fs_op.setParentOperators(parentOpList);
currTask.addDependentTask(uTask);
// If it is map-only task, add the files to be processed
if (uPrsCtx.getMapOnlySubq(pos) && uPrsCtx.getRootTask(pos))
GenMapRedUtils.setTaskPlan(ctx.getCurrAliasId(), ctx.getCurrTopOp(), (mapredWork) currTask.getWork(), false, ctx);
ctx.setCurrTask(uTask);
ctx.setCurrAliasId(null);
ctx.setCurrTopOp(null);