Tom Lane wrote:
=?UTF-8?B?SmFuIFVyYmHFhHNraQ==?= <[EMAIL PROTECTED]> writes:
I'm about to write a oprrest function for the @@ operator. Currently @@
handles multiple cases, like tsvector @@ tsquery, text @@ tsquery,
tsquery @@ tsvector etc. The text @@ text case is for instance handled
by calling to_tsvector and plainto_tsquery on the input arguments.
For a @@ restriction function, I need to have a tsquery and a tsvector,
so in the text @@ text situation I'd end up calling plainto_tsquery
during planning, which would consequently get called again during
execution. Also, I'd need a not-so-elegant if-elsif-elsif sequence at
the beginning of the function. Is this OK/unavoidable/easly avoided?
I'm not following your point here. Sure, there are multiple flavors of
@@, but why shouldn't they each have their own oprrest function?
Because they'll all boil down to the same function. Suppose I have an
oprrest function for tsvector @@ tsquery. An oprrest for text @@ text
would just be:
tv = DatumGetTSVector(DirectFunctionCall1(to_tsvector, PG_GETARG_DATUM(0)));
tq = DatumGetTSQuery(DirectFunctionCall1(plainto_tsquery,
PG_GETARG_DATUM(1)));
res = DirectFunctionCall2(my_oprrest, TSVectorGetDatum(tv),
TSQueryGetDatun(tq))
...
I thought I might avoid having to call ts_tsvector and plainto_tsquery,
because the arguments need to be transformed to tsvector and tsquery
anyway during execution.
--
Jan Urbanski
GPG key ID: E583D7D2
ouden estin
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