lidavidm commented on code in PR #318:
URL: https://github.com/apache/arrow-cookbook/pull/318#discussion_r1308882349
##########
java/source/data.rst:
##########
@@ -23,6 +23,57 @@ Recipes related to compare, filtering or transforming data.
.. contents::
+Append VectorSchemaRoots
+========================
+
+In some cases, VectorSchemaRoot needs to be modeled as a container. To
accomplish
+this, you can use ``VectorSchemaRootAppender.append``. The following code gets
+the three vectors separately, and then appends the three vectors together:
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.IntVector;
+ import org.apache.arrow.vector.VectorSchemaRoot;
+ import org.apache.arrow.vector.util.VectorSchemaRootAppender;
+
+ try (BufferAllocator allocator = new RootAllocator()) {
+ VectorSchemaRoot result = null;
+ IntVector appenderOne = new IntVector("column", allocator);
+ IntVector appenderTwo = new IntVector("column", allocator);
+ appenderOne.allocateNew(2);
+ appenderOne.set(0, 100);
+ appenderOne.set(1, 20);
+ appenderOne.setValueCount(2);
+ appenderTwo.allocateNew(2);
+ appenderTwo.set(0, 34);
+ appenderTwo.set(1, 75);
+ appenderTwo.setValueCount(2);
+ try (
+ final VectorSchemaRoot rootOne = new VectorSchemaRoot(
+ Collections.singletonList(appenderOne));
+ final VectorSchemaRoot rootTwo = new VectorSchemaRoot(
+ Collections.singletonList(appenderTwo))
+ ) {
+ if (result == null) {
Review Comment:
result is always null...
##########
java/source/data.rst:
##########
@@ -23,6 +23,57 @@ Recipes related to compare, filtering or transforming data.
.. contents::
+Append VectorSchemaRoots
+========================
+
+In some cases, VectorSchemaRoot needs to be modeled as a container. To
accomplish
+this, you can use ``VectorSchemaRootAppender.append``. The following code gets
+the three vectors separately, and then appends the three vectors together:
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.IntVector;
+ import org.apache.arrow.vector.VectorSchemaRoot;
+ import org.apache.arrow.vector.util.VectorSchemaRootAppender;
+
+ try (BufferAllocator allocator = new RootAllocator()) {
+ VectorSchemaRoot result = null;
+ IntVector appenderOne = new IntVector("column", allocator);
+ IntVector appenderTwo = new IntVector("column", allocator);
+ appenderOne.allocateNew(2);
+ appenderOne.set(0, 100);
+ appenderOne.set(1, 20);
+ appenderOne.setValueCount(2);
+ appenderTwo.allocateNew(2);
+ appenderTwo.set(0, 34);
+ appenderTwo.set(1, 75);
+ appenderTwo.setValueCount(2);
+ try (
+ final VectorSchemaRoot rootOne = new VectorSchemaRoot(
+ Collections.singletonList(appenderOne));
+ final VectorSchemaRoot rootTwo = new VectorSchemaRoot(
+ Collections.singletonList(appenderTwo))
+ ) {
+ if (result == null) {
+ result = VectorSchemaRoot.create(rootOne.getSchema(),
allocator);
+ result.allocateNew();
+ }
+ VectorSchemaRootAppender.append(result, rootOne, rootTwo);
+ System.out.print(result.contentToTSVString());
+ }
+ result.close();
Review Comment:
try-with-resources
##########
java/source/data.rst:
##########
@@ -23,6 +23,57 @@ Recipes related to compare, filtering or transforming data.
.. contents::
+Append VectorSchemaRoots
+========================
+
+In some cases, VectorSchemaRoot needs to be modeled as a container. To
accomplish
+this, you can use ``VectorSchemaRootAppender.append``. The following code gets
+the three vectors separately, and then appends the three vectors together:
+
+.. testcode::
+
+ import org.apache.arrow.memory.BufferAllocator;
+ import org.apache.arrow.memory.RootAllocator;
+ import org.apache.arrow.vector.IntVector;
+ import org.apache.arrow.vector.VectorSchemaRoot;
+ import org.apache.arrow.vector.util.VectorSchemaRootAppender;
+
+ try (BufferAllocator allocator = new RootAllocator()) {
+ VectorSchemaRoot result = null;
+ IntVector appenderOne = new IntVector("column", allocator);
+ IntVector appenderTwo = new IntVector("column", allocator);
+ appenderOne.allocateNew(2);
+ appenderOne.set(0, 100);
+ appenderOne.set(1, 20);
+ appenderOne.setValueCount(2);
+ appenderTwo.allocateNew(2);
+ appenderTwo.set(0, 34);
+ appenderTwo.set(1, 75);
+ appenderTwo.setValueCount(2);
+ try (
+ final VectorSchemaRoot rootOne = new VectorSchemaRoot(
Review Comment:
you can just use a schema and `VectorSchemaRoot.create` to get rid of the
nesting here by initializing everything in the top-level try-with-resources
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