DRILL-230: Addressing comments in code review, abstract out references to HazelCache and add comments

1 files changed, 93 insertions, 0 deletions

diff --git a/exec/java-exec/src/test/java/org/apache/drill/exec/util/BatchPrinter.java b/exec/java-exec/src/test/java/org/apache/drill/exec/util/BatchPrinter.java
new file mode 100644
index 000000000..aa68752b7
--- /dev/null
+++ b/exec/java-exec/src/test/java/org/apache/drill/exec/util/BatchPrinter.java
@@ -0,0 +1,93 @@
+/**
+ * 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.drill.exec.util;
+
+import com.beust.jcommander.internal.Lists;
+import org.apache.commons.lang.StringUtils;
+import org.apache.drill.exec.exception.SchemaChangeException;
+import org.apache.drill.exec.record.VectorAccessible;
+import org.apache.drill.exec.record.VectorWrapper;
+import org.apache.drill.exec.record.selection.SelectionVector4;
+import org.apache.drill.exec.rpc.RpcException;
+import org.apache.drill.exec.vector.ValueVector;
+
+import java.util.List;
+
+/**
+ * This is a tool for printing the content of record batches to screen. Used for debugging.
+ */
+public class BatchPrinter {
+  public static void printHyperBatch(VectorAccessible batch) {
+    List<String> columns = Lists.newArrayList();
+    List<ValueVector> vectors = Lists.newArrayList();
+    int numBatches = 0;
+    for (VectorWrapper vw : batch) {
+      columns.add(vw.getValueVectors()[0].getField().getName());
+      numBatches = vw.getValueVectors().length;
+    }
+    int width = columns.size();
+      for (int i = 0; i < numBatches; i++) {
+        int rows = batch.iterator().next().getValueVectors()[i].getMetadata().getValueCount();
+        for (int j = 0; j < rows; j++) {
+          for (VectorWrapper vw : batch) {
+            Object o = vw.getValueVectors()[i].getAccessor().getObject(j);
+            if (o instanceof byte[]) {
+              String value = new String((byte[]) o);
+              System.out.printf("| %-15s",value.length() <= 15 ? value : value.substring(0, 14));
+            } else {
+              String value = o.toString();
+              System.out.printf("| %-15s",value.length() <= 15 ? value : value.substring(0,14));
+            }
+          }
+          System.out.printf("|\n");
+        }
+      }
+      System.out.printf("|\n");
+  }
+  public static void printBatch(VectorAccessible batch) {
+    List<String> columns = Lists.newArrayList();
+    List<ValueVector> vectors = Lists.newArrayList();
+    for (VectorWrapper vw : batch) {
+      columns.add(vw.getValueVector().getField().getName());
+      vectors.add(vw.getValueVector());
+    }
+    int width = columns.size();
+    int rows = vectors.get(0).getMetadata().getValueCount();
+    for (int row = 0; row < rows; row++) {
+      if (row%50 == 0) {
+        System.out.println(StringUtils.repeat("-", width * 17 + 1));
+        for (String column : columns) {
+          System.out.printf("| %-15s", width <= 15 ? column : column.substring(0, 14));
+        }
+        System.out.printf("|\n");
+        System.out.println(StringUtils.repeat("-", width*17 + 1));
+      }
+      for (ValueVector vv : vectors) {
+        Object o = vv.getAccessor().getObject(row);
+        if (o instanceof byte[]) {
+          String value = new String((byte[]) o);
+          System.out.printf("| %-15s",value.length() <= 15 ? value : value.substring(0, 14));
+        } else {
+          String value = o.toString();
+          System.out.printf("| %-15s",value.length() <= 15 ? value : value.substring(0,14));
+        }
+      }
+      System.out.printf("|\n");
+    }
+  }
+}