tsvector @@ tsquery
tsquery @@ tsvector
text @@ tsquery
text @@ text
The first two of these we saw already. The form text@@tsquery is equivalent to to_tsvector(x) @@ y. The form text@@text is equivalent to to_tsvector(x) @@ plainto_tsquery(y).
Question:
In the expression: to_tsvector(x) @@ plainto_tsquery(y)
what do x and y refer to exactly?
are they correspond to the left-hand and right-hand sides of the original expression (text @@ text) ?
if yes , i think it's better to mention the order of the x and y like : (x @@ y ) or ( y @@ x)
