SOLR:如何在MinFieldValueUpdateProcessorFactory处理器中忽略0(零)值

Question

我们在另一个字段中添加了自定义价格字段"所有价格"；。

<processor class="solr.CloneFieldUpdateProcessorFactory">
<str name="source">CustomPrice1</str>
<str name="source">CustomPrice2</str>
<str name="source">CustomPrice3</str>
<str name="dest">all_prices</str>
</processor>

所以，在solr中，它看起来像

"CustomPrice1":79.95,
"CustomPrice2":69.95,
"CustomPrice3":59.95,
"all_prices":[79.95,69.95,59.95],

因此，我们添加了处理器"；MinFieldValueUpdateProcessorFactory"；如下所示：

<processor class="solr.MinFieldValueUpdateProcessorFactory">
<str name="fieldName">all_prices</str>
</processor>

现在，solr中的数据如下：

"CustomPrice1":79.95,
"CustomPrice2":69.95,
"CustomPrice3":59.95,
"all_prices":[59.95],

现在，在某些情况下，当我们的自定义价格为零时，如下所示：

"CustomPrice1":24.95,
"CustomPrice2":0.0,
"all_prices":[0.0],

因此，在这种情况下，我们只想忽略0(零(值，并将第二个最小值代入all_price。如何做到这一点？

Answer 1

您可以定义如下所示的类

package mysolr;
import java.util.Collection;
import java.util.Collections;
import org.apache.solr.common.SolrException;
import org.apache.solr.core.SolrCore;
import org.apache.solr.update.processor.FieldMutatingUpdateProcessor.FieldNameSelector;
import static org.apache.solr.common.SolrException.ErrorCode.BAD_REQUEST;
import static org.apache.solr.update.processor.FieldMutatingUpdateProcessor.SELECT_NO_FIELDS;
public final class SecondMinFieldValueUpdateProcessorFactory extends FieldValueSubsetUpdateProcessorFactory {

@Override
@SuppressWarnings({"unchecked"})
public Collection<Object> pickSubset(@SuppressWarnings({"rawtypes"})Collection values) {
@SuppressWarnings({"rawtypes"})
Collection result = values;
try {
Object[] array = values.toArray();
Arrays.sort(array);
Object res = (int)array[0] == 0 ? array[1] : array[0];
result.clear();
result.add(res);

} catch (ClassCastException e) {
throw new SolrException
(BAD_REQUEST, 
"Field values are not mutually comparable: " + e.getMessage(), e);
}
return result;
}

@Override
public FieldNameSelector getDefaultSelector(SolrCore core) {
return SELECT_NO_FIELDS;
}

}

使用此代码，您需要创建一个名为"SecondMinFieldValueUpdateProcessorFactory .jar"的jar。

在solrConfig.xml中，请添加以下更改。

<lib dir="${solr.install.dir:../../../..}/plugins/" regex="SecondMinFieldValueUpdateProcessorFactory .jar" />
<updateRequestProcessorChain name="add-unknown-fields-to-the-schema" default="${update.autoCreateFields:true}"
processor="uuid,remove-blank,field-name-mutating,parse-boolean,parse-long,parse-double,parse-date,add-schema-fields">
<processor class="mysolr.SecondMinFieldValueUpdateProcessorFactory "/>
<processor class="solr.LogUpdateProcessorFactory"/>
<processor class="solr.DistributedUpdateProcessorFactory"/>
<processor class="solr.RunUpdateProcessorFactory"/>
</updateRequestProcessorChain>