Github user JamesRTaylor commented on a diff in the pull request:

    https://github.com/apache/phoenix/pull/294#discussion_r172711644
  
    --- Diff: 
phoenix-core/src/main/java/org/apache/phoenix/expression/function/ArrayRemoveFunction.java
 ---
    @@ -0,0 +1,79 @@
    +/*
    + * 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.phoenix.expression.function;
    +
    +import java.util.List;
    +
    +import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
    +import org.apache.phoenix.expression.Expression;
    +import org.apache.phoenix.parse.FunctionParseNode;
    +import org.apache.phoenix.schema.SortOrder;
    +import org.apache.phoenix.schema.TypeMismatchException;
    +import org.apache.phoenix.schema.types.PArrayDataTypeDecoder;
    +import org.apache.phoenix.schema.types.PArrayDataTypeEncoder;
    +import org.apache.phoenix.schema.types.PBinaryArray;
    +import org.apache.phoenix.schema.types.PDataType;
    +import org.apache.phoenix.schema.types.PVarbinary;
    +import org.apache.phoenix.schema.types.PVarbinaryArray;
    +
    +@FunctionParseNode.BuiltInFunction(name = ArrayRemoveFunction.NAME, args = 
{
    +           @FunctionParseNode.Argument(allowedTypes = { 
PBinaryArray.class, PVarbinaryArray.class }),
    +           @FunctionParseNode.Argument(allowedTypes = { PVarbinary.class 
}, defaultValue = "null") })
    --- End diff --
    
    I filed PHOENIX-4644 with a patch so that you can get rid of this 
defaultValue. You'll also need to add the nodeClassName attribute here as you 
see for ARRAY_APPEND.


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