Vincenzo,
As I read the source code; SchemaField.java
/**
* Sanity checks that the properties of this field type are plausible
* for a field that may be used to get a FieldCacheSource, throwing
* an appropriate exception (including the field name) if it is not.
* FieldType subclasses can choose to call this method in their
* getValueSource implementation
* @see FieldType#getValueSource
*/
public void checkFieldCacheSource() throws SolrException {
if ( multiValued() ) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST,
"can not use FieldCache on multivalued field: "
+ getName());
}
if (! hasDocValues() ) {
if ( ! ( indexed() && null != this.type.getUninversionType(this) ) ) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST,
"can not use FieldCache on a field w/o
docValues unless it is indexed and supports Uninversion: "
+ getName());
}
}
}
Seems like FieldCache are not allowed to un-invert values for
multi-valued fields.
I can suspect the reason, multiple values will eat up more memory? Not
sure, someone else can weigh in.
Amrit Sarkar
Search Engineer
Lucidworks, Inc.
415-589-9269
www.lucidworks.com
Twitter http://twitter.com/lucidworks
LinkedIn: https://www.linkedin.com/in/sarkaramrit2
Medium: https://medium.com/@sarkaramrit2
On Mon, Feb 26, 2018 at 7:37 PM, Vincenzo D'Amore <v.dam...@gmail.com>
wrote:
> Hi,
>
> while trying to run a group query on a multivalue field I received this
> error:
>
> can not use FieldCache on multivalued field:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <response>
>
> <lst name="responseHeader">
> <bool name="zkConnected">true</bool>
> <int name="status">400</int>
> <int name="QTime">4</int>
> </lst>
> <lst name="error">
> <lst name="metadata">
> <str name="error-class">org.apache.solr.common.SolrException</str>
> <str name="root-error-class">org.apache.solr.common.
> SolrException</str>
> </lst>
> <str name="msg">can not use FieldCache on multivalued field:
> categoryLevels</str>
> <int name="code">400</int>
> </lst>
> </response>
>
> I don't understand why this is happening.
>
> Do you know any way to work around this problem?
>
> Thanks in advance,
> Vincenzo
>
> --
> Vincenzo D'Amore
>
