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Add the full set of comparison functions for type TID, including a btree

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opclass.  This is not so much because anyone's likely to create an index
on TID, as that sorting TIDs can be useful.  Also added max and min
aggregates while at it, so that one can investigate the clusteredness of
a table with queries like SELECT min(ctid), max(ctid) FROM tab WHERE ...
Greg Stark and Tom Lane
This commit is contained in:
Tom Lane
2006-07-21 20:51:33 +00:00
parent bc660c4237
commit 0144eb92bb
9 changed files with 167 additions and 51 deletions
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9
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.279 2006/04/08 18:49:52 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.280 2006/07/21 20:51:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -538,6 +538,13 @@ extern Datum tidrecv(PG_FUNCTION_ARGS);
extern Datum tidsend(PG_FUNCTION_ARGS);
extern Datum tideq(PG_FUNCTION_ARGS);
extern Datum tidne(PG_FUNCTION_ARGS);
extern Datum tidlt(PG_FUNCTION_ARGS);
extern Datum tidle(PG_FUNCTION_ARGS);
extern Datum tidgt(PG_FUNCTION_ARGS);
extern Datum tidge(PG_FUNCTION_ARGS);
extern Datum bttidcmp(PG_FUNCTION_ARGS);
extern Datum tidlarger(PG_FUNCTION_ARGS);
extern Datum tidsmaller(PG_FUNCTION_ARGS);
extern Datum currtid_byreloid(PG_FUNCTION_ARGS);
extern Datum currtid_byrelname(PG_FUNCTION_ARGS);