[GitHub] [lucene-solr] tflobbe commented on a change in pull request #1620: SOLR-14590 : Alternative approach

[GitBox <gi...@apache.org>]

tflobbe commented on a change in pull request #1620:
URL: https://github.com/apache/lucene-solr/pull/1620#discussion_r446435394



##########
File path: solr/core/src/java/org/apache/solr/schema/RankField.java
##########
@@ -0,0 +1,92 @@
+/*
+ * 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.solr.schema;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.apache.lucene.document.FeatureField;
+import org.apache.lucene.index.IndexableField;
+import org.apache.lucene.index.IndexableFieldType;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.SortField;
+import org.apache.lucene.search.TermQuery;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.response.TextResponseWriter;
+import org.apache.solr.search.QParser;
+import org.apache.solr.uninverting.UninvertingReader.Type;
+
+public class RankField extends FieldType {
+  
+  public static final String INTERNAL_RANK_FIELD_NAME = "_internal_rank_field";
+
+  @Override
+  public Type getUninversionType(SchemaField sf) {
+    throw null;
+  }
+
+  @Override
+  public void write(TextResponseWriter writer, String name, IndexableField f) throws IOException {
+  }
+  
+  @Override
+  protected void init(IndexSchema schema, Map<String,String> args) {
+    super.init(schema, args);
+    if (schema.getFieldOrNull(INTERNAL_RANK_FIELD_NAME) != null) {
+      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "A field named \"" + INTERNAL_RANK_FIELD_NAME + "\" can't be defined in the schema");
+    }
+    for (int prop:new int[] {STORED, DOC_VALUES, OMIT_TF_POSITIONS, SORT_MISSING_FIRST, SORT_MISSING_LAST}) {
+      if ((trueProperties & prop) != 0) {
+        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Property \"" + getPropertyName(prop) + "\" can't be set to true in RankFields");
+      }
+    }
+    for (int prop:new int[] {UNINVERTIBLE, INDEXED, MULTIVALUED}) {
+      if ((falseProperties & prop) != 0) {
+        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Property \"" + getPropertyName(prop) + "\" can't be set to false in RankFields");
+      }
+    }
+    properties &= ~(UNINVERTIBLE | STORED | DOC_VALUES);
+    
+  }
+
+  @Override
+  protected IndexableField createField(String name, String val, IndexableFieldType type) {
+    if (val == null || val.isEmpty()) {
+      return null;
+    }
+    float featureValue;
+    try {
+      featureValue = Float.parseFloat(val);
+    } catch (NumberFormatException nfe) {
+      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "Error while creating field '" + name + "' from value '" + val + "'. Expecting float.", nfe);
+    }
+    return new FeatureField(INTERNAL_RANK_FIELD_NAME, name, featureValue);
+  }
+
+  @Override
+  public Query getFieldQuery(QParser parser, SchemaField field, String externalVal) {

Review comment:
       Good idea. I'll add that




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