siddharthteotia commented on code in PR #15350:
URL: https://github.com/apache/pinot/pull/15350#discussion_r2059659109
##########
pinot-core/src/main/java/org/apache/pinot/core/operator/combine/merger/SelectionOnlyResultsBlockMerger.java:
##########
@@ -46,15 +50,42 @@ public void mergeResultsBlocks(SelectionResultsBlock
mergedBlock, SelectionResul
DataSchema mergedDataSchema = mergedBlock.getDataSchema();
DataSchema dataSchemaToMerge = blockToMerge.getDataSchema();
assert mergedDataSchema != null && dataSchemaToMerge != null;
- if (!mergedDataSchema.equals(dataSchemaToMerge)) {
- String errorMessage =
- String.format("Data schema mismatch between merged block: %s and
block to merge: %s, drop block to merge",
+ QueryContext mergedQueryContext = mergedBlock.getQueryContext();
+ if (!mergedDataSchema.equals(dataSchemaToMerge) && mergedQueryContext !=
null
+ && mergedQueryContext.isSelectStarQuery()) {
+ Map<String, Integer> mergedBlockIndexMap =
mergedDataSchema.getColumnNameToIndexMap();
+ Map<String, Integer> blockToMergeIndexMap =
dataSchemaToMerge.getColumnNameToIndexMap();
+
+ List<String> commonColumns =
mergedBlockIndexMap.keySet().stream().filter(blockToMergeIndexMap::containsKey)
+ .collect(Collectors.toList());
+
+ if (commonColumns.isEmpty()) {
+ String errorMessage = String.format("No common columns to merge
between merged block:"
+ + " %s and block to merge: %s", mergedDataSchema,
dataSchemaToMerge);
+ LOGGER.debug(errorMessage);
+
mergedBlock.addErrorMessage(QueryErrorMessage.safeMsg(QueryErrorCode.MERGE_RESPONSE,
errorMessage));
+ return;
+ }
+
+ List<Integer> mergedIndices =
commonColumns.stream().map(mergedBlockIndexMap::get).collect(Collectors.toList());
+ List<Integer> toMergeIndices =
commonColumns.stream().map(blockToMergeIndexMap::get).collect(Collectors.toList());
+
+ SelectionOperatorUtils.mergeMatchingColumns(mergedBlock, blockToMerge,
_numRowsToKeep, mergedIndices,
+ toMergeIndices);
+ // Update the data schema of the merged block to only include common
columns
Review Comment:
You may want to add an example in comments to describe the logic in this if
block
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