add test

backends-velox/src/test/java/org/apache/gluten/vectorized/ArrowColumnVectorTest.java

@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gluten.vectorized;
+
+import org.apache.spark.sql.execution.vectorized.MutableColumnarRow;
+import org.apache.spark.sql.types.Decimal;
+import org.apache.spark.sql.types.StructType;
+import org.apache.spark.util.TaskResources$;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ArrowColumnVectorTest {
+
+  @Test
+  public void testWriteByMutableColumnarRow() {
+    TaskResources$.MODULE$.runUnsafe(
+        () -> {
+          final ArrowWritableColumnVector[] columns = newArrowColumns("a decimal(20, 1)", 20);
+          MutableColumnarRow row = new MutableColumnarRow(columns);
+          Decimal decimal = new Decimal();
+          decimal.set(234, 20, 1);
+          row.setDecimal(0, decimal, 20);
+          Assert.assertEquals(row.getDecimal(0, 20, 1), decimal);
+          return null;
+        });
+  }
+
+  private static ArrowWritableColumnVector[] newArrowColumns(String schema, int numRows) {
+    ArrowWritableColumnVector[] columns =
+        ArrowWritableColumnVector.allocateColumns(numRows, StructType.fromDDL(schema));
+    for (ArrowWritableColumnVector col : columns) {
+      col.setValueCount(numRows);
+    }
+    return columns;
+  }
+}