gianm commented on a change in pull request #11082:
URL: https://github.com/apache/druid/pull/11082#discussion_r610769060
##########
File path:
server/src/main/java/org/apache/druid/segment/indexing/DataSchema.java
##########
@@ -192,6 +176,89 @@ private static DimensionsSpec computeDimensionsSpec(
return
dimensionsSpec.withDimensionExclusions(additionalDimensionExclusions);
}
+ private static Set<String> computeInputFieldNames(
+ final TimestampSpec timestampSpec,
+ final DimensionsSpec dimensionsSpec,
+ final AggregatorFactory[] aggregators
+ )
+ {
+ final Set<String> fields = new HashSet<>();
+
+ fields.add(timestampSpec.getTimestampColumn());
+ fields.addAll(dimensionsSpec.getDimensionNames());
+ Arrays.stream(aggregators)
+ .flatMap(aggregator -> aggregator.requiredFields().stream())
+ .forEach(fields::add);
+
+ return fields;
+ }
+
+ /**
+ * Computes the set of field names that are specified by the provided
dimensions and aggregator lists.
+ *
+ * If either list is null, it is ignored.
+ *
+ * @throws IllegalArgumentException if there are duplicate field names, or
if any dimension or aggregator
+ * has a null name
+ */
+ private static Set<String> computeAndValidateOutputFieldNames(
+ @Nullable final DimensionsSpec dimensionsSpec,
+ @Nullable final AggregatorFactory[] aggregators
+ )
+ {
+ // Field name -> where it was seen
+ final Map<String, Multiset<String>> fields = new TreeMap<>();
+
+ fields.computeIfAbsent(ColumnHolder.TIME_COLUMN_NAME, k ->
TreeMultiset.create()).add(
+ StringUtils.format(
+ "primary timestamp (%s cannot appear as a dimension or metric)",
+ ColumnHolder.TIME_COLUMN_NAME
+ )
+ );
+
+ if (dimensionsSpec != null) {
+ for (int i = 0; i < dimensionsSpec.getDimensions().size(); i++) {
+ final String field = dimensionsSpec.getDimensions().get(i).getName();
+ if (Strings.isNullOrEmpty(field)) {
+ throw new IAE("Encountered dimension with null or empty name at
position %d", i);
+ }
+
+ fields.computeIfAbsent(field, k ->
TreeMultiset.create()).add("dimensions list");
+ }
+ }
+
+ if (aggregators != null) {
+ for (int i = 0; i < aggregators.length; i++) {
+ final String field = aggregators[i].getName();
+ if (Strings.isNullOrEmpty(field)) {
+ throw new IAE("Encountered metric with null or empty name at
position %d", i);
+ }
+
+ fields.computeIfAbsent(field, k ->
TreeMultiset.create()).add("metricsSpec list");
+ }
+ }
+
+ final List<String> errors = new ArrayList<>();
+
+ for (Map.Entry<String, Multiset<String>> entry : fields.entrySet()) {
+ if
(entry.getValue().entrySet().stream().mapToInt(Multiset.Entry::getCount).sum()
> 1) {
+ errors.add(
+ StringUtils.format(
+ "[%s] seen in %s",
Review comment:
It _could_ happen, but I was thinking it would still be understandable.
The message would be like:
```
Cannot specify a column more than once: [metric1] seen in metricsSpec list
```
I was thinking that the user would be able to look at the metricsSpec and
see that `metric1` is there more than once. But I'm happy to take suggestions
on better error messages.
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