Solr 7.6.0: How to combine different QueryParser in one query?

Question

I just want to combine block join query and main-query with edismax-parser as I do it for solr < 7.2

berlin OR _query_:"{!parent which=type:book}page_content:berlin"

But edismax cannot be the default-Parser for this purpose any more(s. https://issues.apache.org/jira/browse/SOLR-11501)

So it works with lucene-QueryParser for querying parents:

q={!parent which="type:book"}{!edismax qf='page_content' v='berlin'}

it still works for adding main query like

q=title:berlin* AND {!parent which="type:book"}{!edismax qf='page_content' v='berlin'}

but when I try

q={!edismax qf='title' v='berlin'} OR {!parent which="type:book"}{!edismax qf='page_content' v='berlin'}

only the first part of the query is evaluated.

My docs are:

<add>
  <doc>
    <field name="id">1</field>
    <field name="type">book</field>
    <field name="title">Book about Berlin</field>
    <field name="pages">
    <doc>
      <field name="id">11</field>
      <field name="type">page</field>
      <field name="page_content">berlin in winter</field>
    </doc>
    <doc>
      <field name="id">12</field>
      <field name="type">page</field>
      <field name="page_content">berlin in spring</field>
    </doc>
    <doc>
      <field name="id">13</field>
      <field name="type">page</field>
      <field name="page_content">berlin in summer</field>
    </doc>
  </field>
 </doc>
 <doc>
    <field name="id">2</field>
    <field name="type">book</field>
    <field name="title">Big book about Tokio</field>
    <field name="pages">
    <doc>
      <field name="id">21</field>
      <field name="type">page</field>
      <field name="page_content">tokio in winter</field>
    </doc>
    <doc>
      <field name="id">22</field>
      <field name="type">page</field>
      <field name="page_content">tokio in spring</field>
    </doc>
    <doc>
      <field name="id">23</field>
      <field name="type">page</field>
      <field name="page_content">tokio in summer</field>
    </doc>
  </field>
 </doc>
</add>

Does anybody have the same problem?

Thanks a lot!

Answer 1

That is because, as of Solr 7.3, the defaults regarding searchable fields for edismax actually prohibits the use of embedded query.

Fortunately, this behavior can be managed with uf parameter.

uf : Specifies which schema fields the end user is allowed to explicitly query and to toggle whether embedded Solr queries are supported. This parameter supports wildcards. Multiple fields must be separated by a space.

The default is to allow all fields and no embedded Solr queries, equivalent to uf=* -_query_.

Set uf=* _query_ to allow embedded queries.

I tested it on Solr 7.7.1, it works but I had to wrap the embedded query in double quotes otherwise the whole query fails returning 0 result without any notice.

This query should work :

defType=edismax&uf=* _query_&q=title:berlin* OR "{!parent which="type:book"}page_content:berlin"

Note : There are examples in documentation for Solr < 7.3 mentioning a comma-separated list in uf parameter, but the expected separator is definitely a space.

For those who are not using edismax you will have to set luceneMatchVersion=7.1.0 for full backward compatibility.