Data statistics for which field is not included in solr

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1 solr does not contain content field data query (for statistical purposes)

-content:*

If you are connected to the previous field, the position of the parentheses is important:

TableName:AA AND-(content:*)

Incorrect writing: if (- content:*) has no value

2 data that solr statistics will not be empty. Note that this data indicates that there is this field, but the value of the field is empty, which is essentially different from 1.

-content: ""

Note: the statistics of 2 will not include the data that does not include cotent fields.

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