Ben-Zvi commented on a change in pull request #1367: DRILL-6585:
PartitionSender clones vectors, but shares field metdata
URL: https://github.com/apache/drill/pull/1367#discussion_r201137510
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File path: exec/vector/src/main/codegen/templates/BasicTypeHelper.java
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@@ -233,10 +227,54 @@ public static ValueVector getNewVector(String name,
BufferAllocator allocator, M
throw new UnsupportedOperationException(buildErrorMessage("get holder
reader implementation", type, mode));
}
- public static ValueVector getNewVector(MaterializedField field,
BufferAllocator allocator){
+ public static ValueVector getNewVector(String name, BufferAllocator
allocator, MajorType type, CallBack callBack) {
+ MaterializedField field = MaterializedField.create(name, type);
+ return getNewVector(field, allocator, callBack);
+ }
+
+ public static ValueVector getNewVector(MaterializedField field,
BufferAllocator allocator) {
return getNewVector(field, allocator, null);
}
- public static ValueVector getNewVector(MaterializedField field,
BufferAllocator allocator, CallBack callBack){
+
+ /**
+ * Create a new vector by cloning the metadata from an existing vector. Use
this
+ * variation when the metadata is already in use and so should <i>not</i> be
+ * attached to the new vector.
+ *
+ * @param field field metadata to be cloned for the new vector
+ * @param allocator allocator to use to allocate memory for the vector
+ * @param callBack callBack when the schema of the vector changes (not
typically
+ * used in modern Drill)
+ * @return the new vector with no memory allocated
+ * @see #getNewVector(MaterializedField, BufferAllocator, CallBack) for when
+ * the metadata need not be cloned
+ */
+
+ public static ValueVector getClonedVector(MaterializedField field,
BufferAllocator allocator, CallBack callBack) {
+ MaterializedField newField = MaterializedField.create(field.getName(),
field.getType());
Review comment:
Isn't `field.getType()` just returning the type as is ? So where does the
cloning happen ?
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