Change dimensionToSchemaMap to dimensionSchemas and override ARRAY_INGEST_MODE to array (#16909)

A follow-up PR for #16864. Just renames dimensionToSchemaMap to dimensionSchemas and always overrides ARRAY_INGEST_MODE context value to array for MSQ compaction.

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java

@@ -1951,7 +1951,7 @@ public class ControllerImpl implements Controller
             columnMappings,
             isRollupQuery,
             querySpec.getQuery(),
-            destination.getDimensionToSchemaMap()
+            destination.getDimensionSchemas()
         );
 
     return new DataSchema(
@@ -2127,11 +2127,11 @@ public class ControllerImpl implements Controller
       final String outputColumnName,
       @Nullable final ColumnType queryType,
       QueryContext context,
-      @Nullable Map<String, DimensionSchema> dimensionToSchemaMap
+      @Nullable Map<String, DimensionSchema> dimensionSchemas
   )
   {
-    if (dimensionToSchemaMap != null && dimensionToSchemaMap.containsKey(outputColumnName)) {
-      return dimensionToSchemaMap.get(outputColumnName);
+    if (dimensionSchemas != null && dimensionSchemas.containsKey(outputColumnName)) {
+      return dimensionSchemas.get(outputColumnName);
     }
     // In case of ingestion, or when metrics are converted to dimensions when compaction is performed without rollup,
     // we won't have an entry in the map. For those cases, use the default config.
@@ -2150,7 +2150,7 @@ public class ControllerImpl implements Controller
       final ColumnMappings columnMappings,
       final boolean isRollupQuery,
       final Query<?> query,
-      @Nullable final Map<String, DimensionSchema> dimensionToSchemaMap
+      @Nullable final Map<String, DimensionSchema> dimensionSchemas
   )
   {
     // Log a warning unconditionally if arrayIngestMode is MVD, since the behaviour is incorrect, and is subject to
@@ -2237,13 +2237,13 @@ public class ControllerImpl implements Controller
               outputColumnName,
               type,
               query.context(),
-              dimensionToSchemaMap
+              dimensionSchemas
           );
         } else {
           // complex columns only
           if (DimensionHandlerUtils.DIMENSION_HANDLER_PROVIDERS.containsKey(type.getComplexTypeName())) {
             dimensions.add(
-                getDimensionSchema(outputColumnName, type, query.context(), dimensionToSchemaMap)
+                getDimensionSchema(outputColumnName, type, query.context(), dimensionSchemas)
             );
           } else if (!isRollupQuery) {
             aggregators.add(new PassthroughAggregatorFactory(outputColumnName, type.getComplexTypeName()));
@@ -2255,7 +2255,7 @@ public class ControllerImpl implements Controller
                 outputColumnName,
                 type,
                 query.context(),
-                dimensionToSchemaMap
+                dimensionSchemas
             );
           }
         }
@@ -2283,14 +2283,14 @@ public class ControllerImpl implements Controller
       String outputColumn,
       ColumnType type,
       QueryContext context,
-      Map<String, DimensionSchema> dimensionToSchemaMap
+      Map<String, DimensionSchema> dimensionSchemas
   )
   {
     if (outputColumnAggregatorFactories.containsKey(outputColumn)) {
       aggregators.add(outputColumnAggregatorFactories.get(outputColumn));
     } else {
       dimensions.add(
-          getDimensionSchema(outputColumn, type, context, dimensionToSchemaMap)
+          getDimensionSchema(outputColumn, type, context, dimensionSchemas)
       );
     }
   }

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQCompactionRunner.java

@@ -503,7 +503,8 @@ public class MSQCompactionRunner implements CompactionRunner
     context.putIfAbsent(QueryContexts.FINALIZE_KEY, false);
     // Only scalar or array-type dimensions are allowed as grouping keys.
     context.putIfAbsent(GroupByQueryConfig.CTX_KEY_ENABLE_MULTI_VALUE_UNNESTING, false);
-    context.putIfAbsent(MultiStageQueryContext.CTX_ARRAY_INGEST_MODE, "array");
+    // Always override CTX_ARRAY_INGEST_MODE since it can otherwise lead to mixed ARRAY and MVD types for a column.
+    context.put(MultiStageQueryContext.CTX_ARRAY_INGEST_MODE, "array");
     return context;
   }
 

extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/destination/DataSourceMSQDestination.java

@@ -52,7 +52,7 @@ public class DataSourceMSQDestination implements MSQDestination
   private final List<Interval> replaceTimeChunks;
 
   @Nullable
-  private final Map<String, DimensionSchema> dimensionToSchemaMap;
+  private final Map<String, DimensionSchema> dimensionSchemas;
 
   @JsonCreator
   public DataSourceMSQDestination(
@@ -60,14 +60,14 @@ public class DataSourceMSQDestination implements MSQDestination
       @JsonProperty("segmentGranularity") Granularity segmentGranularity,
       @JsonProperty("segmentSortOrder") @Nullable List<String> segmentSortOrder,
       @JsonProperty("replaceTimeChunks") @Nullable List<Interval> replaceTimeChunks,
-      @JsonProperty("dimensionToSchemaMap") @Nullable Map<String, DimensionSchema> dimensionToSchemaMap
+      @JsonProperty("dimensionSchemas") @Nullable Map<String, DimensionSchema> dimensionSchemas
   )
   {
     this.dataSource = Preconditions.checkNotNull(dataSource, "dataSource");
     this.segmentGranularity = Preconditions.checkNotNull(segmentGranularity, "segmentGranularity");
     this.segmentSortOrder = segmentSortOrder != null ? segmentSortOrder : Collections.emptyList();
     this.replaceTimeChunks = replaceTimeChunks;
-    this.dimensionToSchemaMap = dimensionToSchemaMap;
+    this.dimensionSchemas = dimensionSchemas;
 
     if (replaceTimeChunks != null) {
       // Verify that if replaceTimeChunks is provided, it is nonempty.
@@ -138,9 +138,9 @@ public class DataSourceMSQDestination implements MSQDestination
   @Nullable
   @JsonProperty
   @JsonInclude(JsonInclude.Include.NON_NULL)
-  public Map<String, DimensionSchema> getDimensionToSchemaMap()
+  public Map<String, DimensionSchema> getDimensionSchemas()
   {
-    return dimensionToSchemaMap;
+    return dimensionSchemas;
   }
 
   /**
@@ -177,13 +177,13 @@ public class DataSourceMSQDestination implements MSQDestination
            && Objects.equals(segmentGranularity, that.segmentGranularity)
            && Objects.equals(segmentSortOrder, that.segmentSortOrder)
            && Objects.equals(replaceTimeChunks, that.replaceTimeChunks)
-           && Objects.equals(dimensionToSchemaMap, that.dimensionToSchemaMap);
+           && Objects.equals(dimensionSchemas, that.dimensionSchemas);
   }
 
   @Override
   public int hashCode()
   {
-    return Objects.hash(dataSource, segmentGranularity, segmentSortOrder, replaceTimeChunks, dimensionToSchemaMap);
+    return Objects.hash(dataSource, segmentGranularity, segmentSortOrder, replaceTimeChunks, dimensionSchemas);
   }
 
   @Override
@@ -194,7 +194,7 @@ public class DataSourceMSQDestination implements MSQDestination
            ", segmentGranularity=" + segmentGranularity +
            ", segmentSortOrder=" + segmentSortOrder +
            ", replaceTimeChunks=" + replaceTimeChunks +
-           ", dimensionToSchemaMap=" + dimensionToSchemaMap +
+           ", dimensionSchemas=" + dimensionSchemas +
            '}';
   }
 

extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/indexing/destination/DataSourceMSQDestinationTest.java

@@ -35,7 +35,7 @@ public class DataSourceMSQDestinationTest
   public void testEquals()
   {
     EqualsVerifier.forClass(DataSourceMSQDestination.class)
-                  .withNonnullFields("dataSource", "segmentGranularity", "segmentSortOrder", "dimensionToSchemaMap")
+                  .withNonnullFields("dataSource", "segmentGranularity", "segmentSortOrder", "dimensionSchemas")
                   .withPrefabValues(
                       Map.class,
                       ImmutableMap.of(