/**
* Get a list of aliases for non-hidden columns
*
* @param max the maximum number of columns to return
* @return a list of non-hidden column names no greater in size than max
*/
public List<String> getReferenceableColumnAliases(String tableAlias, int max) {
int count = 0;
Set<String> columnNames = new LinkedHashSet<String>();
int tables = rslvMap.size();
Map<String, ColumnInfo> mapping = rslvMap.get(tableAlias);
if (mapping != null) {
for (Map.Entry<String, ColumnInfo> entry : mapping.entrySet()) {
if (max > 0 && count >= max) {
break;
}
ColumnInfo columnInfo = entry.getValue();
if (!columnInfo.isHiddenVirtualCol()) {
columnNames.add(entry.getKey());
count++;
}
}
} else {
for (ColumnInfo columnInfo : getColumnInfos()) {
if (max > 0 && count >= max) {
break;
}
if (!columnInfo.isHiddenVirtualCol()) {
String[] inverse = !isExprResolver ? reverseLookup(columnInfo.getInternalName()) : null;
if (inverse != null) {
columnNames.add(
inverse[0] == null || tables <= 1 ? inverse[1] : inverse[0] + "." + inverse[1]);
} else {
columnNames.add(columnInfo.getAlias());
}
count++;
}
}
}
return new ArrayList<String>(columnNames);
}
private void createMapReduce4Merge(FileSinkOperator fsOp, GenMRProcContext ctx, String finalName)
throws SemanticException {
Task<? extends Serializable> currTask = ctx.getCurrTask();
RowSchema inputRS = fsOp.getSchema();
// create a reduce Sink operator - key is the first column
ArrayList<ExprNodeDesc> keyCols = new ArrayList<ExprNodeDesc>();
keyCols.add(TypeCheckProcFactory.DefaultExprProcessor.getFuncExprNodeDesc("rand"));
// value is all the columns in the FileSink operator input
ArrayList<ExprNodeDesc> valueCols = new ArrayList<ExprNodeDesc>();
for (ColumnInfo ci : inputRS.getSignature()) {
valueCols.add(
new ExprNodeColumnDesc(
ci.getType(), ci.getInternalName(), ci.getTabAlias(), ci.getIsVirtualCol()));
}
// create a dummy tableScan operator
Operator<? extends Serializable> tsMerge = OperatorFactory.get(TableScanDesc.class, inputRS);
ArrayList<String> outputColumns = new ArrayList<String>();
for (int i = 0; i < valueCols.size(); i++) {
outputColumns.add(SemanticAnalyzer.getColumnInternalName(i));
}
ReduceSinkDesc rsDesc =
PlanUtils.getReduceSinkDesc(
new ArrayList<ExprNodeDesc>(), valueCols, outputColumns, false, -1, -1, -1);
OperatorFactory.getAndMakeChild(rsDesc, inputRS, tsMerge);
ParseContext parseCtx = ctx.getParseCtx();
FileSinkDesc fsConf = fsOp.getConf();
// Add the extract operator to get the value fields
RowResolver out_rwsch = new RowResolver();
RowResolver interim_rwsch = ctx.getParseCtx().getOpParseCtx().get(fsOp).getRowResolver();
Integer pos = Integer.valueOf(0);
for (ColumnInfo colInfo : interim_rwsch.getColumnInfos()) {
String[] info = interim_rwsch.reverseLookup(colInfo.getInternalName());
out_rwsch.put(
info[0],
info[1],
new ColumnInfo(
pos.toString(),
colInfo.getType(),
info[0],
colInfo.getIsVirtualCol(),
colInfo.isHiddenVirtualCol()));
pos = Integer.valueOf(pos.intValue() + 1);
}
Operator<ExtractDesc> extract =
OperatorFactory.getAndMakeChild(
new ExtractDesc(
new ExprNodeColumnDesc(
TypeInfoFactory.stringTypeInfo,
Utilities.ReduceField.VALUE.toString(),
"",
false)),
new RowSchema(out_rwsch.getColumnInfos()));
TableDesc ts = (TableDesc) fsConf.getTableInfo().clone();
fsConf
.getTableInfo()
.getProperties()
.remove(org.apache.hadoop.hive.metastore.api.Constants.META_TABLE_PARTITION_COLUMNS);
FileSinkDesc newFSD =
new FileSinkDesc(
finalName, ts, parseCtx.getConf().getBoolVar(HiveConf.ConfVars.COMPRESSRESULT));
FileSinkOperator newOutput =
(FileSinkOperator) OperatorFactory.getAndMakeChild(newFSD, inputRS, extract);
HiveConf conf = parseCtx.getConf();
MapredWork cplan = createMergeTask(conf, tsMerge, fsConf);
cplan.setReducer(extract);
// NOTE: we should gather stats in MR1 (rather than the merge MR job)
// since it is unknown if the merge MR will be triggered at execution time.
MoveWork dummyMv =
new MoveWork(
null,
null,
null,
new LoadFileDesc(fsConf.getDirName(), finalName, true, null, null),
false);
ConditionalTask cndTsk = createCondTask(conf, currTask, dummyMv, cplan, fsConf.getDirName());
LinkMoveTask(ctx, newOutput, cndTsk);
}
@Override
@SuppressWarnings("unchecked")
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx ctx, Object... nodeOutputs)
throws SemanticException {
ColumnPrunerProcCtx cppCtx = (ColumnPrunerProcCtx) ctx;
Operator<? extends OperatorDesc> op = (Operator<? extends OperatorDesc>) nd;
RowResolver inputRR = cppCtx.getParseContext().getOpParseCtx().get(op).getRowResolver();
List<String> prunedCols = cppCtx.getPrunedColList(op.getChildOperators().get(0));
Operator<? extends OperatorDesc> parent = op.getParentOperators().get(0);
RowResolver parentRR = cppCtx.getParseContext().getOpParseCtx().get(parent).getRowResolver();
List<ColumnInfo> sig = parentRR.getRowSchema().getSignature();
List<String> colList = new ArrayList<String>();
for (ColumnInfo cI : sig) {
colList.add(cI.getInternalName());
}
if (prunedCols.size() != inputRR.getRowSchema().getSignature().size()
&& !(op.getChildOperators().get(0) instanceof SelectOperator)) {
ArrayList<ExprNodeDesc> exprs = new ArrayList<ExprNodeDesc>();
ArrayList<String> outputs = new ArrayList<String>();
Map<String, ExprNodeDesc> colExprMap = new HashMap<String, ExprNodeDesc>();
RowResolver outputRS = new RowResolver();
for (String internalName : prunedCols) {
String[] nm = inputRR.reverseLookup(internalName);
ColumnInfo valueInfo = inputRR.get(nm[0], nm[1]);
ExprNodeDesc colDesc =
new ExprNodeColumnDesc(
valueInfo.getType(),
valueInfo.getInternalName(),
nm[0],
valueInfo.getIsVirtualCol());
exprs.add(colDesc);
outputs.add(internalName);
outputRS.put(
nm[0],
nm[1],
new ColumnInfo(
internalName,
valueInfo.getType(),
nm[0],
valueInfo.getIsVirtualCol(),
valueInfo.isHiddenVirtualCol()));
colExprMap.put(internalName, colDesc);
}
SelectDesc select = new SelectDesc(exprs, outputs, false);
Operator<? extends OperatorDesc> child = op.getChildOperators().get(0);
op.removeChild(child);
SelectOperator sel =
(SelectOperator)
OperatorFactory.getAndMakeChild(
select, new RowSchema(outputRS.getColumnInfos()), op);
OperatorFactory.makeChild(sel, child);
OpParseContext parseCtx = new OpParseContext(outputRS);
cppCtx.getParseContext().getOpParseCtx().put(sel, parseCtx);
sel.setColumnExprMap(colExprMap);
}
cppCtx.getPrunedColLists().put(op, colList);
return null;
}