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https://issues.apache.org/jira/browse/DRILL-3232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14981941#comment-14981941
]
ASF GitHub Bot commented on DRILL-3232:
---------------------------------------
Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r43472878
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/impl/UnionListReader.java
---
@@ -0,0 +1,101 @@
+/*******************************************************************************
+
+ * 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.complex.impl;
+
+import org.apache.drill.common.types.TypeProtos.MajorType;
+import org.apache.drill.common.types.TypeProtos.MinorType;
+import org.apache.drill.common.types.Types;
+import org.apache.drill.exec.expr.holders.UnionHolder;
+import org.apache.drill.exec.vector.UInt4Vector;
+import org.apache.drill.exec.vector.ValueVector;
+import org.apache.drill.exec.vector.complex.ListVector;
+import org.apache.drill.exec.vector.complex.reader.FieldReader;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter.ListWriter;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter;
+import org.apache.drill.exec.vector.complex.writer.FieldWriter;
+
+public class UnionListReader extends AbstractFieldReader {
--- End diff --
doc it.
> Modify existing vectors to allow type promotion
> -----------------------------------------------
>
> Key: DRILL-3232
> URL: https://issues.apache.org/jira/browse/DRILL-3232
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Execution - Codegen, Execution - Data Types, Execution -
> Relational Operators, Functions - Drill
> Reporter: Steven Phillips
> Assignee: Hanifi Gunes
> Fix For: 1.3.0
>
>
> Support the ability for existing vectors to be promoted similar to supported
> implicit casting rules.
> For example:
> INT > DOUBLE > STRING > EMBEDDED
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