Apache Solr Reference Guide Covering Apache Solr 6.0

In a Sort expression. For example:
sort=div(popularity,price) desc, score desc
Add the results of functions as psuedo-fields to documents in query results. For instance, for:
&fl=sum(x, y),id,a,b,c,score
the output would be:
...
foo
40
0.343
...
Use in a parameter that is explicitly for specifying functions, such as the EDisMax query parser's boost p
aram, or DisMax query parser's bf (boost function) parameter. (Note that the bf parameter actually takes
a list of function queries separated by white space and each with an optional boost. Make sure you
eliminate any internal white space in single function queries when using bf). For example:
q=dismax&bf="ord(popularity)^0.5 recip(rord(price),1,1000,1000)^0.3"
Introduce a function query inline in the lucene QParser with the _val_ keyword. For example:
q=_val_:mynumericfield _val_:"recip(rord(myfield),1,2,3)"
Only functions with fast random access are recommended.
Available Functions
The table below summarizes the functions available for function queries.
Function Description Syntax Examples
abs
and
Returns the absolute value of the
specified value or function.
Returns a value of true if and only if all
of its operands evaluate to true.
abs(x)
abs(-5)
and(not(exists(popularity)),exists(p
rice)): returns true for any document which
has a value in the price field, but does not have
a value in the popularity field
"constant" Specifies a floating point constant. 1.5
def
div
def is short for default. Returns the
value of field "field", or if the field does
not exist, returns the default value
specified. and yields the first value
where exists()==true.)
Divides one value or function by
another. div(x,y) divides x by y.
def(rating,5): This def() function returns
the rating, or if no rating specified in the doc,
returns 5
def(myfield, 1.0): equivalent to if(exist
s(myfield),myfield,1.0)
div(1,y)
div(sum(x,100),max(y,1))
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