Github user mehant commented on a diff in the pull request:
https://github.com/apache/drill/pull/190#discussion_r41701556
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/record/RecordIterator.java
---
@@ -0,0 +1,252 @@
+/*
+ * 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.record;
+
+import java.util.Iterator;
+import java.util.Map;
+
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.ops.OperatorContext;
+import org.apache.drill.exec.physical.impl.sort.RecordBatchData;
+import org.apache.drill.exec.record.RecordBatch.IterOutcome;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Lists;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Range;
+import com.google.common.collect.Sets;
+import com.google.common.collect.TreeRangeMap;
+
+
+public class RecordIterator implements VectorAccessible {
--- End diff --
RecordIterator seems to provide two useful abstractions
1. Provide a abstraction to iterate over records (hiding away details about
batch boundaries etc)
2. Provide an abstraction to be able to mark a record and go back and
reiterate from that record.
What do you think about building the second abstraction on top of the first
(MarkAndResetIterator and RecordIterator)? I feel the first abstraction is very
generic and can be used in most operators cleaning out some of the redundant
code.
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