feat(datahub-client): improve Avro schema conversions

Author: sgomezvillamor

metadata-integration/java/datahub-schematron/lib/src/main/java/io/datahubproject/schematron/converters/avro/AvroSchemaConverter.java

@@ -23,6 +23,8 @@ public class AvroSchemaConverter implements SchemaConverter<Schema> {
 
   private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
   private static final Map<String, Supplier<SchemaFieldDataType.Type>> LOGICAL_TYPE_MAPPING;
+  public static final String ARRAY_ITEMS_FIELD_NAME = "items";
+  public static final String MAP_VALUE_FIELD_NAME = "value";
 
   static {
     Map<String, Supplier<SchemaFieldDataType.Type>> logicalTypeMap = new HashMap<>();
@@ -337,6 +339,18 @@ private void processArrayField(
     // Set parent type for proper array handling
     DataHubType arrayDataHubType = new DataHubType(ArrayType.class, elementType);
 
+    SchemaField arrayField =
+        new SchemaField()
+            .setFieldPath(fieldPath.asString())
+            .setType(arrayDataHubType.asSchemaFieldType())
+            .setNativeDataType("array(" + elementType + ")")
+            .setNullable(isNullable || defaultNullable)
+            .setIsPartOfKey(fieldPath.isKeySchema());
+
+    populateCommonProperties(field, arrayField);
+    log.debug("Array field path: {} with doc: {}", fieldPath.asString(), field.doc());
+    fields.add(arrayField);
+
     // Process element type if it's complex
     if (elementSchema.getType() == Schema.Type.RECORD
         || elementSchema.getType() == Schema.Type.ARRAY
@@ -349,25 +363,12 @@ private void processArrayField(
               new FieldElement(Collections.singletonList("array"), new ArrayList<>(), null, null));
       Schema.Field elementField =
           new Schema.Field(
-              field.name(),
+              ARRAY_ITEMS_FIELD_NAME,
               elementSchema,
               elementSchema.getDoc() != null ? elementSchema.getDoc() : field.doc(),
               null // TODO: What is the default value for an array element?
               );
-      processField(elementField, fieldPath, defaultNullable, fields, isNullable, arrayDataHubType);
-    } else {
-
-      SchemaField arrayField =
-          new SchemaField()
-              .setFieldPath(fieldPath.asString())
-              .setType(arrayDataHubType.asSchemaFieldType())
-              .setNativeDataType("array(" + elementType + ")")
-              .setNullable(isNullable || defaultNullable)
-              .setIsPartOfKey(fieldPath.isKeySchema());
-
-      populateCommonProperties(field, arrayField);
-      log.debug("Array field path: {} with doc: {}", fieldPath.asString(), field.doc());
-      fields.add(arrayField);
+      processField(elementField, fieldPath, defaultNullable, fields, true, arrayDataHubType);
     }
   }
 
@@ -386,14 +387,25 @@ private void processMapField(
     DataHubType mapDataHubType = new DataHubType(MapType.class, valueType);
     fieldPath = fieldPath.expandType("map", mapSchema);
 
+    SchemaField mapField =
+        new SchemaField()
+            .setFieldPath(fieldPath.asString())
+            .setType(mapDataHubType.asSchemaFieldType())
+            .setNativeDataType("map<string," + valueType + ">")
+            .setNullable(isNullable || defaultNullable)
+            .setIsPartOfKey(fieldPath.isKeySchema());
+
+    populateCommonProperties(field, mapField);
+    fields.add(mapField);
+
     // Process value type if it's complex
     if (valueSchema.getType() == Schema.Type.RECORD
         || valueSchema.getType() == Schema.Type.ARRAY
         || valueSchema.getType() == Schema.Type.MAP
         || valueSchema.getType() == Schema.Type.UNION) {
       Schema.Field valueField =
           new Schema.Field(
-              field.name(),
+              MAP_VALUE_FIELD_NAME,
               valueSchema,
               valueSchema.getDoc() != null ? valueSchema.getDoc() : field.doc(),
               null // TODO: What is the default value for a map value?
@@ -404,18 +416,7 @@ private void processMapField(
               .clonePlus(
                   new FieldElement(
                       Collections.singletonList("map"), new ArrayList<>(), null, null));
-      processField(valueField, valueFieldPath, defaultNullable, fields, isNullable, mapDataHubType);
-    } else {
-      SchemaField mapField =
-          new SchemaField()
-              .setFieldPath(fieldPath.asString())
-              .setType(mapDataHubType.asSchemaFieldType())
-              .setNativeDataType("map<string," + valueType + ">")
-              .setNullable(isNullable || defaultNullable)
-              .setIsPartOfKey(fieldPath.isKeySchema());
-
-      populateCommonProperties(field, mapField);
-      fields.add(mapField);
+      processField(valueField, valueFieldPath, defaultNullable, fields, true, mapDataHubType);
     }
   }