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[Postgres] Add order set aggregate functions support.

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go-jet 2021-12-07 14:07:44 +01:00
parent 04c14f29bf
commit 605f1c8e3d
4 changed files with 135 additions and 1 deletions
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22
postgres/functions.go
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@ -336,3 +336,25 @@ func explicitLiteralCast(expresion Expression) jet.Expression {
return expresion
}
// MODE computes the most frequent value of the aggregated argument
var MODE = jet.MODE
// PERCENTILE_CONT computes a value corresponding to the specified fraction within the ordered set of
// aggregated argument values. This will interpolate between adjacent input items if needed.
func PERCENTILE_CONT(fraction FloatExpression) *jet.OrderSetAggregateFunc {
return jet.PERCENTILE_CONT(castFloatLiteral(fraction))
}
// PERCENTILE_DISC computes the first value within the ordered set of aggregated argument values whose position
// in the ordering equals or exceeds the specified fraction. The aggregated argument must be of a sortable type.
func PERCENTILE_DISC(fraction FloatExpression) *jet.OrderSetAggregateFunc {
return jet.PERCENTILE_DISC(castFloatLiteral(fraction))
}
func castFloatLiteral(fraction FloatExpression) FloatExpression {
if _, ok := fraction.(jet.LiteralExpression); ok {
return CAST(fraction).AS_DOUBLE() // to make postgres aware of the type
}
return fraction
}