Ich muss jedes Element von 2 Arrays multiplizieren und eine Spalte projizieren, die ein Array ist und jedes Element ist das Produktergebnis.Produkt von Elementen mit gleichem Index in 2 Arrays
Beispiel:
select * from vetor_query;
Returns:
query_id |pesos |
---------|----------------------------------------------------------------------------------------------------|
1 |{2.0000,0.4150,2.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000} |
Und die Abfrage:
select * from vetor_documento;
Returns:
doc |pesos |
-------|----------------------------------------------------------------------------------------------------|
d1.txt |{3.0000,0.8301,4.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000} |
d2.txt |{2.0000,0.0000,0.0000,0.0000,2.0000,2.0000,2.0000,2.0000,2.0000,0.0000,0.0000,0.0000,0.0000,0.0000} |
d3.txt |{0.0000,1.0729,0.0000,0.0000,0.0000,0.0000,2.0000,1.0000,0.0000,2.0000,2.0000,0.0000,0.0000,0.0000} |
d4.txt |{0.0000,1.0729,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,0.0000,5.1699,4.0000,4.0000} |
Ich muss beide Abfragen kombinieren (Kreuz Join) und als Ergebnis Array von internen Produkt für jede doc
und query_id
produzieren.
Mein erster Versuch dieser war:
select vq.query_id, vd.doc, unnest(vq.pesos) * unnest(vd.pesos)
from vetor_query vq
cross join vetor_documento vd;
Allerdings ergibt es diesen Fehler:
Functions and operators can take at most one set argument