Plone.app.querystring and Catalog Index Types

Plone Support Add-on Development
1

I have a TextLine-Field on some Contenttypes called "referencenumber" and a Catalog FieldIndex "referencenumber", the referencenumber is cataloged.

If a search is performed "Search referencenumber 3202", I get only results for the Fullnumber, not for partial pieces.

IndexType: FieldIndex

The following queries are ok:

{
  "query": [
    {
      "i": "referencenumber",
      "o": "plone.app.querystring.operation.string.contains",
      "v": "3202"
    }
  ]
}

{
  "query": [
    {
      "i": "referencenumber",
      "o": "plone.app.querystring.operation.string.is",
      "v": "3202"
    }
  ]
}

These queries return nothing from Catalog:

{
  "query": [
    {
      "i": "referencenumber",
      "o": "plone.app.querystring.operation.string.contains",
      "v": "320"
    }
  ]
}

{
  "query": [
    {
      "i": "referencenumber",
      "o": "plone.app.querystring.operation.string.contains",
      "v": "320*"
    }
  ]
}

For this test i put the referencenumber in the description field.
For IndexType ZCTextIndex the query returns a result

{
  "query": [
    {
      "i": "Description",
      "o": "plone.app.querystring.operation.string.contains",
      "v": "320*"
    }
  ]
}

I guess the IndexType is the Problem, does anyone know more between the relation of plone.app.querystring.operations and the Indextype of Catalog?

2

Is this not by design?

https://zope.readthedocs.io/en/latest/zopebook/SearchingZCatalog.html#searching-field-indexes

3

Yes looks like. I will the extend SearchableText Indexer....
Thanks for clarification