sankarh commented on a change in pull request #2689:
URL: https://github.com/apache/hive/pull/2689#discussion_r719480605



##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/arrow/ArrowColumnarBatchSerDe.java
##########
@@ -122,6 +122,7 @@ private static Field toField(String name, TypeInfo 
typeInfo) {
           case SHORT:
             return Field.nullable(name, MinorType.SMALLINT.getType());
           case INT:
+            new Field(name, new FieldType(false, new ArrowType.Int(32, true), 
null), null);

Review comment:
       This statement is no-op. Should be removed.

##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/arrow/ArrowColumnarBatchSerDe.java
##########
@@ -160,7 +161,7 @@ private static Field toField(String name, TypeInfo 
typeInfo) {
         final ListTypeInfo listTypeInfo = (ListTypeInfo) typeInfo;
         final TypeInfo elementTypeInfo = listTypeInfo.getListElementTypeInfo();
         return new Field(name, FieldType.nullable(MinorType.LIST.getType()),
-            Lists.newArrayList(toField(DEFAULT_ARROW_FIELD_NAME, 
elementTypeInfo)));
+            Lists.newArrayList(toField(name, elementTypeInfo)));

Review comment:
       Why default name (DEFAULT_ARROW_FIELD_NAME) is changed in LIST but used 
in UNION?

##########
File path: 
itests/hive-unit/src/test/java/org/apache/hive/jdbc/TestJdbcWithMiniLlapVectorArrow.java
##########
@@ -64,8 +65,8 @@ public static void beforeTest() throws Exception {
     return new LlapArrowRowInputFormat(Long.MAX_VALUE);
   }
 
-  // Currently MAP type is not supported. Add it back when Arrow 1.0 is 
released.
-  // See: SPARK-21187
+  // Currently, loading from a text file gives errors with Map dataType.
+  // This needs to be fixed when adding support for non-ORC writes (text and 
parquet) for the llap-ext-client.

Review comment:
       Remove this statement and create a follow-up JIRA to fix this issue and 
link with this one.

##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/arrow/ArrowColumnarBatchSerDe.java
##########
@@ -185,7 +186,7 @@ private static Field toField(String name, TypeInfo 
typeInfo) {
         final TypeInfo keyTypeInfo = mapTypeInfo.getMapKeyTypeInfo();
         final TypeInfo valueTypeInfo = mapTypeInfo.getMapValueTypeInfo();
         final StructTypeInfo mapStructTypeInfo = new StructTypeInfo();
-        mapStructTypeInfo.setAllStructFieldNames(Lists.newArrayList("keys", 
"values"));
+        mapStructTypeInfo.setAllStructFieldNames(Lists.newArrayList("key", 
"value"));

Review comment:
       Why is this naming change significant?

##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/io/arrow/ArrowColumnarBatchSerDe.java
##########
@@ -170,7 +171,7 @@ private static Field toField(String name, TypeInfo 
typeInfo) {
         for (int i = 0; i < structSize; i++) {
           structFields.add(toField(fieldNames.get(i), fieldTypeInfos.get(i)));
         }
-        return new Field(name, FieldType.nullable(MinorType.STRUCT.getType()), 
structFields);
+        return new Field(name, new FieldType(false, new ArrowType.Struct(), 
null), structFields);

Review comment:
       Why struct value is not-nullable?

##########
File path: ql/src/java/org/apache/hadoop/hive/ql/io/arrow/Serializer.java
##########
@@ -226,7 +226,7 @@ public ArrowWrapperWritable 
serializeBatch(VectorizedRowBatch vectorizedRowBatch
   }
 
   private static FieldType toFieldType(TypeInfo typeInfo) {
-    return new FieldType(true, toArrowType(typeInfo), null);
+    return new FieldType(false, toArrowType(typeInfo), null);

Review comment:
       Why is it changed to nullable=false?




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