okumin commented on code in PR #5245:
URL: https://github.com/apache/hive/pull/5245#discussion_r1597554417
##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/translator/opconventer/HiveGBOpConvUtil.java:
##########
@@ -1028,32 +1028,65 @@ private static OpAttr genReduceSideGB1NoMapGB(OpAttr
inputOpAf, GBInfo gbInfo,
List<ExprNodeDesc> reduceValues = rs.getConf().getValueCols();
ArrayList<AggregationDesc> aggregations = new ArrayList<AggregationDesc>();
int udafColStartPosInOriginalGB = gbInfo.gbKeys.size();
- // the positions in rsColInfoLst are as follows
- // --grpkey--,--distkey--,--values--
- // but distUDAF may be before/after some non-distUDAF,
- // i.e., their positions can be mixed.
- // so for all UDAF we first check to see if it is groupby key, if not is
it distinct key
- // if not it should be value
- Map<Integer, List<ExprNodeDesc>> indexToParameter = new TreeMap<>();
+
+ final List<List<ColumnInfo>> paramColInfoTable = new
ArrayList<>(gbInfo.udafAttrs.size());
+ final List<List<String>> distinctColumnNameTable = new
ArrayList<>(gbInfo.udafAttrs.size());
+ final Map<ColumnInfo, String> distinctColumnMapping = new HashMap<>();
for (int i = 0; i < gbInfo.udafAttrs.size(); i++) {
- UDAFAttrs udafAttr = gbInfo.udafAttrs.get(i);
- ArrayList<ExprNodeDesc> aggParameters = new ArrayList<ExprNodeDesc>();
+ final UDAFAttrs udafAttr = gbInfo.udafAttrs.get(i);
+ final List<ColumnInfo> paramColInfo = new
ArrayList<>(udafAttr.udafParams.size());
+ final List<String> distinctColNames = new
ArrayList<>(udafAttr.udafParams.size());
- ColumnInfo rsUDAFParamColInfo;
- ExprNodeDesc udafParam;
- ExprNodeDesc constantPropDistinctUDAFParam;
for (int j = 0; j < udafAttr.udafParams.size(); j++) {
- int argPos = getColInfoPos(udafAttr.udafParams.get(j), gbInfo);
- rsUDAFParamColInfo = rsColInfoLst.get(argPos);
- String rsUDAFParamName = rsUDAFParamColInfo.getInternalName();
+ final int argPos = getColInfoPos(udafAttr.udafParams.get(j), gbInfo);
+ final ColumnInfo rsUDAFParamColInfo = rsColInfoLst.get(argPos);
+ paramColInfo.add(rsUDAFParamColInfo);
+ final String distinctColumnName;
if (udafAttr.isDistinctUDAF && lastReduceKeyColName != null) {
- rsUDAFParamName = Utilities.ReduceField.KEY.name() + "." +
lastReduceKeyColName
+ distinctColumnName = Utilities.ReduceField.KEY.name() + "." +
lastReduceKeyColName
+ ":" + numDistinctUDFs + "." +
SemanticAnalyzer.getColumnInternalName(j);
+ distinctColumnMapping.putIfAbsent(rsUDAFParamColInfo,
distinctColumnName);
+ } else {
+ distinctColumnName = null;
+ }
+ distinctColNames.add(distinctColumnName);
+ }
+
+ paramColInfoTable.add(paramColInfo);
+ distinctColumnNameTable.add(distinctColNames);
+
+ if(udafAttr.isDistinctUDAF) {
+ numDistinctUDFs++;
+ }
+ }
+
+ // the positions in rsColInfoLst are as follows
+ // --grpkey--,--distkey--,--values--
+ // but distUDAF may be before/after some non-distUDAF,
+ // i.e., their positions can be mixed.
+ // so for all UDAF we first check to see if it is groupby key, if not is
it distinct key
+ // if not it should be value
+ final Map<Integer, List<ExprNodeDesc>> indexToParameter = new TreeMap<>();
+ for (int i = 0; i < paramColInfoTable.size(); i++) {
+ final ArrayList<ExprNodeDesc> aggParameters = new ArrayList<>();
+
+ for (int j = 0; j < paramColInfoTable.get(i).size(); j++) {
+ final ColumnInfo rsUDAFParamColInfo = paramColInfoTable.get(i).get(j);
+
+ final String rsUDAFParamName;
+ if (distinctColumnNameTable.get(i).get(j) != null) {
+ rsUDAFParamName = distinctColumnNameTable.get(i).get(j);
+ } else if (distinctColumnMapping.get(rsUDAFParamColInfo) != null) {
+ // This UDAF is not labeled with DISTINCT, but it refers to a
DISTINCT key.
+ // The original internal name is already obsolete as any DISTINCT
keys are renamed.
+ rsUDAFParamName = distinctColumnMapping.get(rsUDAFParamColInfo);
+ } else {
+ rsUDAFParamName = rsUDAFParamColInfo.getInternalName();
Review Comment:
`getInternalName` can retain `KEY.col0:{index of RS keys}.col0`. It
conflicts with the name generated by the following logic. So, the one in
`getInternanlName` could be no more available in GroupByOperator.
```
distinctColumnName = Utilities.ReduceField.KEY.name() + "." +
lastReduceKeyColName
+ ":" + numDistinctUDFs + "." +
SemanticAnalyzer.getColumnInternalName(j);
```
Non-Return Path is likely to resolve the correct column name with
RowResolver. This PR would implement the logic by traversing params with two
paths.
Why do we need the two iterations? That's because the non-distinct UDAF may
refer to the input of DISTINCT UDAF which comes later like below.
```
SELECT
SUM(DISTINCT col1),
COUNT(DISTINCT col1),
SUM(col2), -- This has to refer to the key for `SUM(DISTINCT col2)`
MAX(DISTINCT col1),
SUM(DISTINCT col2),
MIN(DISTINCT col1)
FROM test;
```
Note that this method is used only when `hive.map.aggr` is disabled. With it
enabled, non-distinct UDAFs don't refer to DISTINCT keys as they are
deduplicated.
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