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Specifies the type of filtering operation to apply to the field.
Note:
These filter operators are usually only used with String / Text-type
database fields:
Contains
Does not contain
Starts with
Does not start with
Ends with
Does not end with
Using them with numeric or date fields may
not be supported in some cases depending on the field's validation type,
display format and storage formats.
These operators allow filtering by “fragments” of field values, and
these fragments often cannot be parsed or interpreted correctly for fields
that use certain types of format strings.
For example, using the Contains operator on
a date field searching for '12' should work correctly. However, searching for '12/30' may not work
correctly, because the '/' isn't actually stored in the database field.
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