"Felix E. Klee" <felix.klee@xxxxxxx> writes:
BTW, a more future-proof way of doing what you want:
VarChar *text = PG_GETARG_VARCHAR_P(0); int text_len = VARSIZE(text)-VARHDRSZ; char *tmp_text = (char *)malloc(text_len+1); if (tmp_text == NULL) ; /* What now? */ strncpy(tmp_text, VARDATA(text), text_len); tmp_text[text_len] = '\0';
is to let the varchar output routine do it:
Datum text_datum = PG_GETARG_DATUM(0); char *text;
text = DatumGetCString(DirectFunctionCall1(varcharout, text_datum));
This avoids assuming that you know the internal representation of varchar (and if you think that's frozen for eternity, you haven't been reading the discussions of ramping up our locale support...)
This form of dealing with arguments is interesting to learn about. Is there any documentation of this stuff or do I need to dive into the source?
-greg
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
