raincloud: triage 34 slugs, fix VARIANT oracle crash, matrix at 158 ok

- Oracle guard: hardwood's NestedRowReader.getStruct() mis-casts a
  VARIANT-shredded group (metadata/value/typed_value) to its plain
  Struct FieldDesc and throws ClassCastException — an oracle bug, not
  a vortex-java gap. RaincloudConformanceIntegrationTest now aborts on
  group.isVariant() before hitting it, same as the existing isMap()
  guard (unblocks countries-of-the-world, which regressed to a hard
  failure once the corpus was rebuilt with a VARIANT column).
- Triage: 32 untriaged slugs verified ok against the parquet oracle
  (13 large BI slugs + 19 smaller HF/benchmark slugs). squad-v2 and
  mnist flip from gap:268 to ok now that the previous commit's fix
  lands. oasst1 hits a different, new bug — a null Struct row renders
  as {"field":null,...} instead of an empty cell (#270, filed) — so it
  moves from gap:268 to gap:270 rather than to ok.

Matrix: 124 ok / 0 gaps / 123 untriaged -> 158 ok / 1 gap / 85 untriaged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: dfa1

integration/src/test/java/io/github/dfa1/vortex/integration/RaincloudConformanceIntegrationTest.java

@@ -366,6 +366,12 @@ private static String oracleCell(SchemaNode node, RowReader rows, int fieldIndex
             if (group.isMap()) {
                 throw new TestAbortedException("oracle cannot format MAP column: " + group.name());
             }
+            // hardwood's own NestedRowReader.getStruct() mis-casts a VARIANT-shredded group
+            // (metadata/value/typed_value) to its plain-Struct FieldDesc and throws
+            // ClassCastException — an oracle bug, not a vortex-java gap. Abort before hitting it.
+            if (group.isVariant()) {
+                throw new TestAbortedException("oracle cannot format VARIANT column: " + group.name());
+            }
             return oracleJsonObject(group, rows.getStruct(fieldIndex));
         }
         SchemaNode.PrimitiveNode prim = (SchemaNode.PrimitiveNode) node;

integration/src/test/resources/raincloud/expected-status.csv

@@ -29,11 +29,11 @@ aya-dataset,ok
 bank-account-fraud-dataset-neurips-2022,missing_auth
 basketball,untriaged
 behavioral-risk-factor-surveillance-system,ok
-beir-msmarco,untriaged
+beir-msmarco,ok
 bi-arade,ok
 bi-bimbo,ok
 bi-citymaxcapita,ok
-bi-cmsprovider,untriaged
+bi-cmsprovider,ok
 bi-commongovernment,untriaged
 bi-corporations,ok
 bi-eixo,ok
@@ -43,28 +43,28 @@ bi-generico,untriaged
 bi-hashtags,ok
 bi-hatred,ok
 bi-iglocations1,ok
-bi-iglocations2,untriaged
+bi-iglocations2,ok
 bi-iublibrary,ok
-bi-medicare1,untriaged
-bi-medicare2,untriaged
+bi-medicare1,ok
+bi-medicare2,ok
 bi-medicare3,ok
 bi-medpayment1,ok
 bi-medpayment2,ok
-bi-mlb,untriaged
-bi-motos,untriaged
+bi-mlb,ok
+bi-motos,ok
 bi-mulheresmil,ok
-bi-nyc,untriaged
+bi-nyc,ok
 bi-pancreactomy1,ok
-bi-pancreactomy2,untriaged
+bi-pancreactomy2,ok
 bi-physicians,ok
 bi-provider,untriaged
 bi-realestate1,untriaged
 bi-realestate2,untriaged
-bi-redfin1,untriaged
-bi-redfin2,untriaged
-bi-redfin3,untriaged
+bi-redfin1,ok
+bi-redfin2,ok
+bi-redfin3,ok
 bi-redfin4,ok
-bi-rentabilidad,untriaged
+bi-rentabilidad,ok
 bi-romance,ok
 bi-salariesfrance,untriaged
 bi-tablerosistemapenal,ok
@@ -76,7 +76,7 @@ bi-uberlandia,ok
 bi-uscensus,untriaged
 bi-wins,untriaged
 bi-yalelanguages,ok
-bigscience-p3-eval-subset,untriaged
+bigscience-p3-eval-subset,ok
 building-permit-applications-data,untriaged
 c4-en-validation,untriaged
 california-housing-prices,ok
@@ -86,14 +86,14 @@ clickbench-hits,untriaged
 cnn-dailymail,untriaged
 codeparrot-clean-valid,untriaged
 cohere-wikipedia-simple-embed,untriaged
-coig,untriaged
+coig,ok
 coronahack-chest-xraydataset,untriaged
 cosmopedia-stanford,untriaged
 countries-of-the-world,ok
 covid-world-vaccination-progress,ok
 covid19-data-from-john-hopkins-university,untriaged
 crimes-in-boston,untriaged
-databricks-dolly-15k,untriaged
+databricks-dolly-15k,ok
 dbpedia-embeddings,untriaged
 diabetes-health-indicators-dataset,ok
 disease-symptom-description-dataset,untriaged
@@ -103,13 +103,13 @@ emotions-dataset-for-nlp,ok
 fhv_tripdata_2025,ok
 fhvhv_tripdata_2025,untriaged
 finemath-4plus,untriaged
-finepdfs-en-test,untriaged
+finepdfs-en-test,ok
 finetranslations-swedish,untriaged
 fineweb-2-swedish,untriaged
 fineweb-sample-10bt,untriaged
 fitbit,untriaged
 formula-1-world-championship-1950-2020,untriaged
-frames-benchmark,untriaged
+frames-benchmark,ok
 ghcn-daily,untriaged
 glass,ok
 global-fossil-co2-emissions-by-country-2002-2022,untriaged
@@ -119,16 +119,16 @@ glove-6b-50d,ok
 goodbooks-10k,ok
 google-cluster-trace-2011-machine-events,ok
 green_tripdata_2025,ok
-gsm8k,untriaged
+gsm8k,ok
 gtsrb-german-traffic-sign,ok
 hacker-news,untriaged
 heart-disease-health-indicators-dataset,ok
-hellaswag,untriaged
-helpsteer2,untriaged
+hellaswag,ok
+helpsteer2,ok
 hotel-booking-demand,ok
 hotpotqa-fullwiki,untriaged
 housing-prices-dataset,untriaged
-humaneval,untriaged
+humaneval,ok
 insurance,ok
 international-football-results-from-1872-to-2017,ok
 iowa-liquor-sales,untriaged
@@ -139,24 +139,24 @@ librispeech-test-clean,untriaged
 loan-default-dataset,untriaged
 lung-cancer,ok
 marketing-data,ok
-mbpp,untriaged
-medmcqa,untriaged
+mbpp,ok
+medmcqa,ok
 mlcourse,untriaged
-mmlu,untriaged
-mmlu-pro,untriaged
-mmmlu,untriaged
+mmlu,ok
+mmlu-pro,ok
+mmmlu,ok
 mmmu,untriaged
-mnist,untriaged
+mnist,ok
 movies,ok
 new-york-city-airbnb-open-data,untriaged
-news-headlines-dataset-for-sarcasm-detection,untriaged
+news-headlines-dataset-for-sarcasm-detection,ok
 nips-papers,ok
-no-robots,untriaged
+no-robots,ok
 nyc-311,untriaged
 nyc-parking-tickets,untriaged
 nyc-property-sales,ok
 nypd-complaints,untriaged
-oasst1,untriaged
+oasst1,gap:270
 open-food-facts,untriaged
 openlibrary-authors,untriaged
 openlibrary-editions,untriaged
@@ -178,21 +178,21 @@ palmer-archipelago-antarctica-penguin-data,ok
 peoples-speech-clean-validation,untriaged
 personal-key-indicators-of-heart-disease,ok
 pleias-synth,untriaged
-pubmedqa-labeled,untriaged
+pubmedqa-labeled,ok
 sf-salaries,ok
 slimpajama-6b,untriaged
-squad-v2,untriaged
+squad-v2,ok
 stack-overflow-2018-developer-survey,ok
 stackoverflow-badges,untriaged
 stackoverflow-postlinks,ok
 stackoverflow-posts,untriaged
 stackoverflow-tags,ok
 stackoverflow-users,untriaged
-synthetic-text-to-sql,untriaged
+synthetic-text-to-sql,ok
 temperature-change,ok
 tinystories,untriaged
 titanic-dataset,untriaged
-truthfulqa-mc,untriaged
+truthfulqa-mc,ok
 uber-pickups-in-new-york-city,ok
 uci-abalone,ok
 uci-adult,ok