davisusanibar commented on a change in pull request #113:
URL: https://github.com/apache/arrow-cookbook/pull/113#discussion_r781605327
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File path: java/source/data.rst
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@@ -0,0 +1,316 @@
+=================
+Data manipulation
+=================
+
+Recipes related to compare, filtering or transforming data.
+
+.. contents::
+
+We are going to use this util for data manipulation:
+
+.. code-block:: java
+
+ import org.apache.arrow.algorithm.sort.VectorValueComparator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.IntVector;
+ import org.apache.arrow.vector.VarCharVector;
+
+ void setVector(IntVector vector, Integer... values) {
+ final int length = values.length;
+ vector.allocateNew(length);
+ for (int i = 0; i < length; i++) {
+ if (values[i] != null) {
+ vector.set(i, values[i]);
+ }
+ }
+ vector.setValueCount(length);
+ }
+
+ class TestVarCharSorter extends VectorValueComparator<VarCharVector> {
+ @Override
+ public int compareNotNull(int index1, int index2) {
+ byte b1 = vector1.get(index1)[0];
+ byte b2 = vector2.get(index2)[0];
+ return b1 - b2;
+ }
+
+ @Override
+ public VectorValueComparator<VarCharVector> createNew() {
+ return new TestVarCharSorter();
+ }
+ }
+ RootAllocator rootAllocator = new RootAllocator(Long.MAX_VALUE); // deal
with byte buffer allocation
+
+Compare fields on the array
Review comment:
> Should we try to be consistent about calling it a "vector" instead of
an "array"?
For this java cookbook we are decided to reuse "array" word that is used on
python instead of mention "vector" that is only used on java
Array is more common word than Vector because at the end both terms are
working close same
How do you see that?
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