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https://issues.apache.org/jira/browse/DRILL-5324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15968422#comment-15968422
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ASF GitHub Bot commented on DRILL-5324:
---------------------------------------
Github user bitblender commented on a diff in the pull request:
https://github.com/apache/drill/pull/783#discussion_r111495333
--- Diff:
exec/vector/src/main/java/org/apache/drill/exec/vector/accessor/ScalarWriter.java
---
@@ -0,0 +1,32 @@
+/*
+ * 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.vector.accessor;
+
+import java.math.BigDecimal;
+
+import org.joda.time.Period;
+
--- End diff --
Adding a comment here saying that Writers use an implicit index would make
it easier for readers to understand why there is no index parameter and why the
ScalarWriter interface can be inherited-from by both the ColumnWriter and the
ArrayWriter
> Provide simplified column reader/writer for use in tests
> --------------------------------------------------------
>
> Key: DRILL-5324
> URL: https://issues.apache.org/jira/browse/DRILL-5324
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Tools, Build & Test
> Affects Versions: 1.11.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Fix For: 1.11.0
>
>
> In support of DRILL-5323, we wish to provide a very easy way to work with row
> sets. See the comment section for examples of the target API.
> Drill provides over 100 different value vectors, any of which may be required
> to perform a specific unit test. Creating these vectors, populating them, and
> retrieving values, is very tedious. The work is so complex that it acts to
> discourage developers from writing such tests.
> To simplify the task, we wish to provide a simplified row set reader and
> writer. To do that, we need to generate the corresponding column reader and
> writer for each value vector. This ticket focuses on the column-level readers
> and writers, and the required code generation.
> Drill already provides vector readers and writers derived from
> {{FieldReader}}. However, these readers do not provide a uniform get/set
> interface that is type independent on the application side. Instead,
> application code must be aware of the type of the vector, something we seek
> to avoid for test code.
> The reader and writer classes are designed to be used in many contexts, not
> just for testing. As a result, their implementation makes no assumptions
> about the broader row reader and writer, other than that a row index and the
> required value vector are both available.
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