Github user cgivre commented on a diff in the pull request:
https://github.com/apache/drill/pull/258#discussion_r148172786
--- Diff:
contrib/gis/src/main/java/org/apache/drill/exec/expr/fn/impl/gis/STUnionAggregate.java
---
@@ -0,0 +1,114 @@
+/**
+ * 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.gis;
+
+import javax.inject.Inject;
+
+import org.apache.drill.exec.expr.DrillAggFunc;
+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.expr.annotations.Workspace;
+import org.apache.drill.exec.expr.holders.BigIntHolder;
+import org.apache.drill.exec.expr.holders.IntHolder;
+import org.apache.drill.exec.expr.holders.NullableVarBinaryHolder;
+import org.apache.drill.exec.expr.holders.ObjectHolder;
+import org.apache.drill.exec.expr.holders.UInt1Holder;
+
+import com.esri.core.geometry.SpatialReference;
+
+import io.netty.buffer.DrillBuf;
+
+@FunctionTemplate(name = "st_unionaggregate", scope =
FunctionTemplate.FunctionScope.POINT_AGGREGATE)
+public class STUnionAggregate implements DrillAggFunc {
+ @Param NullableVarBinaryHolder in;
+ @Workspace ObjectHolder value;
--- End diff --
I believe the ObjectHolder is deprecated. However, it would be worth
having a discussion about "undeprecating" it as without it, it is really
difficult if not impossible to write aggregate functions.
---
