Before doing it the trial and error way can somebody just make me an
example?
I'm not pretty sure about my interpretation of the comments of the
documentation.
TSQuery
[skipped]
Right, valcrc is computed in pushValue
I couldn't see any place in the code where TSQuery is built in "one
shot" in spite of using pushValue.
That because in all places we could parse rather complex structure. Simple OR-ed
query could be hardcoded as
pushValue('X')
pushValue('YY')
pushOperator(OP_OR);
pushValue('ZZZ')
pushOperator(OP_OR);
You need to call pushValue/pushOperator imagery order of polish notation.
Note, you can do another order:
pushValue('X')
pushValue('YY')
pushValue('ZZZ')
pushOperator(OP_OR);
pushOperator(OP_OR);
So, first example will produce ( X | YY ) | ZZZ, second one X | ( YY | XXX )
Another thing I'd like to know is: what is going to be preferred
during a scan between
'java:1A,2B '::tsvector @@ to_tsquery('java:A | java:B');
vs.
'java:1A,2B '::tsvector @@ to_tsquery('java:AB')
?
they look equivalent. Are they?
Yes, but second one should be more efficient.
--
Teodor Sigaev E-mail: [email protected]
WWW: http://www.sigaev.ru/
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