On Thu, 30 Aug 2007, Bruce Momjian wrote:

Gregory Stark wrote:
"Bruce Momjian" <[EMAIL PROTECTED]> writes:

There is no question things would be clearer with only one text search
data type.  The only value I can see to having a tsquery data type is
that you can store a tsquery value in a column, but why would that be
much better than just storing it in a TEXT field?

When you try storing a tsquery in a column does it alert you if you have an
invalid syntax at that point? Storing it as text would mean not finding out
until you try to use the query.

Yes it does check syntax:

        test=> select 'lkjadsf kjfdsa'::tsquery;
        ERROR:  syntax error in tsearch query: "lkjadsf kjfdsa"

A larger question is how many people store queries in the database to
make it worth the complexity.

you forget about very powerfull query rewriting, which is table driven

Is converting a text query into the internal format faster or less memory
intensive than converting text into the internal representation? When you run
a query like "WHERE '...' @@ col" if there wasn't a tsquery data type then
'...' would have to be parsed over and over again for each row.

No, internally the TEXT string would be converted to something the
system could deal with for that query, which is probably what 99% of all
queries are going to do anyway by calling to_tsquery().

Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: [EMAIL PROTECTED], http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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