4 Commits (abd183e4e718a79ad35e6a53b45155cec6bf8ce3)

Author	SHA1	Message	Date
Tom Lane	31edbadf4a	Downgrade implicit casts to text to be assignment-only, except for the ones ... from the other string-category types; this eliminates a lot of surprising interpretations that the parser could formerly make when there was no directly applicable operator. Create a general mechanism that supports casts to and from the standard string types (text,varchar,bpchar) for *every* datatype, by invoking the datatype's I/O functions. These new casts are assignment-only in the to-string direction, explicit-only in the other, and therefore should create no surprising behavior. Remove a bunch of thereby-obsoleted datatype-specific casting functions. The "general mechanism" is a new expression node type CoerceViaIO that can actually convert between *any* two datatypes if their external text representations are compatible. This is more general than needed for the immediate feature, but might be useful in plpgsql or other places in future. This commit does nothing about the issue that applying the concatenation operator || to non-text types will now fail, often with strange error messages due to misinterpreting the operator as array concatenation. Since it often (not always) worked before, we should either make it succeed or at least give a more user-friendly error; but details are still under debate. Peter Eisentraut and Tom Lane	19 years ago
Neil Conway	05ce7d6a41	Rewrite uuid input and output routines to avoid dependency on the ... nonportable "hh" sprintf(3) length modifier. Instead, do the parsing and output by hand. The code to do this isn't ideal, but this is an interim measure anyway: the uuid type should probably use the in-memory struct layout specified by RFC 4122. For now, this patch should hopefully rectify the buildfarm failures for the uuid test. Along the way, re-add pg_cast entries for uuid <-> varchar, which I mistakenly removed earlier, and bump the catversion.	19 years ago
Neil Conway	74a1a2b8b1	Rename the uuid_t type to pg_uuid_t, to avoid a conflict with any ... definitions of uuid_t that may be provided by the system headers. This should hopefully fix the Win32 build problems reported by Magnus.	19 years ago
Neil Conway	a534068e0e	Add a new builtin type, "uuid". This implements a UUID type, similar to ... that defined in RFC 4122. This patch includes the basic implementation, plus regression tests. Documentation and perhaps some additional functionality will come later. Catversion bumped. Patch from Gevik Babakhani; review from Peter, Tom, and myself.	19 years ago