As described in the linked syntax document. This should be an extension to $setWindowFields.
Shorthand:
$minMaxScaler: <numeric expression>
Or extended:
$minMaxScaler: {
input: <numeric expression>,
min: <constant numeric expression>,
max: <constant numeric expression>
}
Using the defaults for min and max (0 and 1 respectively), given a sequence of numbers in the window
X = x0, x1, … xn, this will calculate:
minMaxScaler(xi) =(xi -min(X)) / (max(X) -min(X))
Now adding parameters smin and smax, for the fully general case we get:
minMaxScaler(xi, smin, smax) =((xi -min(X)) / (max(X) -min(X))*(smax-smin) +smin
You can see that these new terms just adjust the value between 0 and 1 to be in the domain (smin, smax)
For this ticket, only implement the removable window implementations of the window function, to break up how much scope this ticket covers. This means no left unbounded document windows will be supported. A follow up ticket will add in the removable window implementation.
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SERVER-94600 Add 'minMaxScalar' normalization option to $score stage
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SERVER-91279 Add example rank fusion tests which use $setWindowFields
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SERVER-95171 Add example score fusion tests which use $setWindowFields
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- Open
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- Closed
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- Backlog
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