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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/08/03 16:04:05 UTC
[GitHub] [arrow-cookbook] lidavidm commented on a diff in pull request #237: [Java] Added splicing example for IntVector
lidavidm commented on code in PR #237:
URL: https://github.com/apache/arrow-cookbook/pull/237#discussion_r936846099
##########
java/source/create.rst:
##########
@@ -187,4 +187,40 @@ Array of List
.. _`FieldVector`: https://arrow.apache.org/docs/java/reference/org/apache/arrow/vector/FieldVector.html
.. _`ValueVector`: https://arrow.apache.org/docs/java/vector.html
-.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
\ No newline at end of file
+.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
+
+Splicing
+========
+
+Splicing provides a way of copying complete or partial data between same types of Vectors
Review Comment:
```suggestion
Splicing provides a way of copying a range of rows between two vectors of the same type.
```
##########
java/source/create.rst:
##########
@@ -187,4 +187,40 @@ Array of List
.. _`FieldVector`: https://arrow.apache.org/docs/java/reference/org/apache/arrow/vector/FieldVector.html
.. _`ValueVector`: https://arrow.apache.org/docs/java/vector.html
-.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
\ No newline at end of file
+.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
+
+Splicing
+========
+
+Splicing provides a way of copying complete or partial data between same types of Vectors
+
+Splicing IntVector
+------------------
+
+In this example, we want to copy a portion of input Vector to a new Vector.
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.IntVector;
+ import org.apache.arrow.vector.util.TransferPair;
+
+
+ try (BufferAllocator allocator = new RootAllocator();
+ IntVector vector = new IntVector("intVector", allocator);) {
+ for (int i = 0; i < 10; i++) {
+ vector.setSafe(i, i);
+ }
+ vector.setValueCount(10);
+
+ TransferPair tp = vector.getTransferPair(allocator);
+ tp.splitAndTransfer(0, 5);
+ IntVector sliced = (IntVector) tp.getTo();
+ System.out.print(sliced);
+ sliced.clear();
+ }
Review Comment:
Maybe show slicing from a non-zero index?
##########
java/source/create.rst:
##########
@@ -187,4 +187,40 @@ Array of List
.. _`FieldVector`: https://arrow.apache.org/docs/java/reference/org/apache/arrow/vector/FieldVector.html
.. _`ValueVector`: https://arrow.apache.org/docs/java/vector.html
-.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
\ No newline at end of file
+.. _`dictionary-encoding`: https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout
+
+Splicing
+========
+
+Splicing provides a way of copying complete or partial data between same types of Vectors
+
+Splicing IntVector
+------------------
+
+In this example, we want to copy a portion of input Vector to a new Vector.
Review Comment:
```suggestion
In this example, we copy a portion of the input IntVector to a new IntVector.
```
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