praveenc7 commented on code in PR #15350:
URL: https://github.com/apache/pinot/pull/15350#discussion_r2060540330
##########
pinot-common/src/thrift/query.thrift:
##########
@@ -32,6 +32,7 @@ struct PinotQuery {
11: optional map<string, string> queryOptions;
12: optional bool explain;
13: optional map<Expression, Expression> expressionOverrideHints;
+ 14: optional bool selectStarQuery;
Review Comment:
When the broker sends the request to server, we
[expand](https://github.com/apache/pinot/blob/c781ff1fff5bd770311d9da85f22c1df9f10077c/pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseSingleStageBrokerRequestHandler.java#L1733)
* column to actual physical columns
So our options are either use this or have a querpOptions indicating this
info to the server. Given QueryOptions felt hacky or not clean used this thrift
proto to pass-down the info
##########
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));
Review Comment:
Ideally never, was accounting for unknown path. Could be removed
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