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From softwaredoug <>
Subject [GitHub] lucene-solr pull request #49: SOLR-9279 Adds comparison function queries
Date Wed, 06 Jul 2016 12:57:34 GMT
Github user softwaredoug commented on a diff in the pull request:
    --- Diff: lucene/queries/src/java/org/apache/lucene/queries/function/valuesource/
    @@ -0,0 +1,131 @@
    +package org.apache.lucene.queries.function.valuesource;
    + * 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
    + *
    + *
    + *
    + * 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.
    + */
    +import java.util.Map;
    +import org.apache.lucene.index.LeafReaderContext;
    +import org.apache.lucene.queries.function.ValueSource;
    +import org.apache.lucene.queries.function.FunctionValues;
    + * Base class for comparison operators used within if statements
    + * To Solr's if function query a 0 is considered "false", all other values are "true"
    + */
    +public abstract class CompareNumericFunction extends ValueSource {
    --- End diff --
    I thought about BoolFunction, but it seemed unused. I certainly could with no change,
it would only have documentation value.
    Would removing "value" imply this also works on strings? I'm not thoroughly versed here
but when I was looking at IfFunction, I intentionally omitted non-numeric comparions (ie string
comparisons). Hence the name. 

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