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https://issues.apache.org/jira/browse/DRILL-7253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16914447#comment-16914447
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ASF GitHub Bot commented on DRILL-7253:
---------------------------------------
vvysotskyi commented on pull request #1847: DRILL-7253: Read Hive struct w/o
nulls
URL: https://github.com/apache/drill/pull/1847#discussion_r317209323
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/SpecialFunctions.java
##########
@@ -0,0 +1,65 @@
+/*
+ * 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.expr.fn.impl;
+
+import org.apache.drill.exec.expr.DrillSimpleFunc;
+import org.apache.drill.exec.expr.annotations.FunctionTemplate;
+import org.apache.drill.exec.expr.annotations.Output;
+import org.apache.drill.exec.expr.annotations.Param;
+import org.apache.drill.exec.vector.complex.reader.FieldReader;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter;
+
+/**
+ * Container class for functions with {@link
org.apache.calcite.sql.SqlSyntax#SPECIAL} syntax.
+ */
+public class SpecialFunctions {
+
+ private SpecialFunctions() {
+ }
+
+ /**
+ * Implementation of ROW(col1, col2, ..., colN) constructor function. Most
often it's
+ * used to reconstruct struct columns after Calcite's flattening.
+ */
+ @FunctionTemplate(name = "row", scope =
FunctionTemplate.FunctionScope.SIMPLE, isVarArg = true)
Review comment:
It would be useful to point out that this function expects arguments (field
name and field value), ...
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> Read Hive struct w/o nulls
> --------------------------
>
> Key: DRILL-7253
> URL: https://issues.apache.org/jira/browse/DRILL-7253
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Igor Guzenko
> Assignee: Igor Guzenko
> Priority: Major
> Fix For: 1.17.0
>
>
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