I've inherited a Sitecore site that I'm upgrading from 8.2 to 9.2. I've noticed that the query being built in 9.2 is slightly different to the one in 8.2.

There are two relevant fields that get indexed, Date and EndDate. Date is a DateTime and EndDate is a Nullable[DateTime].

Both the 8.2 and 9.2 indexes are indexing the fields correctly as can be seen here:

enter image description here

However, the query generated by Sitecore is not correct as the tdt is not added to the end of the nullable type, but does work for the struct.

["undefined field: "end_date""]

[(((_template:(3da0703f1b6c4c73825d15218599f485) OR _template:(23e003536083498da8880acd4890b9e4)) AND (-_isstandardvalues_b:(True) :)) AND (date_tdt:[2020-04-26T23:00:00Z TO *] OR end_date:[2020-04-26T23:00:00Z TO *]))]

The exact same code works fine in 8.2, is this a bug or has something changed in 9.2?

  • Not sure about this bug but can you confirm if you have a typematch in place for nullable datetime in 8.2? OOTB Sitecore doesn't provide typematch for nullable DateTime and looks like you had it manually added in 8.2 and it's missing after the upgrade? Apr 27, 2020 at 13:56
  • I've checked the 8.2 version of the site and there's no specific typematch for the nullable datetime type there either. This was the first place I looked, but as 8.2 and 9.2 match I didn't think the issue would be there.
    – SamMullins
    Apr 27, 2020 at 14:07
  • 1
    can you try by adding a new fieldtype in addFieldByFieldName section for your nullable DateTime for type match with nullValue- <fieldType fieldName="end_date" returnType="datetime" nullValue="NULLVALUE" emptyString="EMPTYVALUE"/>. Apr 27, 2020 at 18:23
  • Thanks @MahendraShekhawat that's done the trick!
    – SamMullins
    Apr 28, 2020 at 9:25
  • Adding this in the answer for future use Apr 28, 2020 at 9:56

1 Answer 1


Not sure how it was handled in Sitecore version 8.2 but for Sitecore 9.2 sometimes you want to run queries for null or empty string values. Sitecore supports this in the LINQ layer and in the indexing layer by storing physical values of EMPTYVALUE and NULLVALUE. Sitecore translates this in the LINQ layer, so all you need to do is write LINQ queries as usual.

You must specify which fields you want to have an empty string and null support for in the FieldMap. OOTB Sitecore does not store empty strings and nulls in your index because they waste space. To specify a NULLVALUE Field, you need to add it in <fieldNames hint="raw:AddFieldByFieldName"> section of your Solr search default config or in a patch config. For your question you can add below line in it for end_date -

<fieldType fieldName="end_date" returnType="datetime" nullValue="NULLVALUE" emptyString="EMPTYVALUE"/>

Make sure to add nullValue="NULLVALUE" and emptyString="EMPTYVALUE" attributes.

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