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Fix up foreign-key mechanism so that there is a sound semantic basis for the

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equality checks it applies, instead of a random dependence on whatever
operators might be named "=".  The equality operators will now be selected
from the opfamily of the unique index that the FK constraint depends on to
enforce uniqueness of the referenced columns; therefore they are certain to be
consistent with that index's notion of equality.  Among other things this
should fix the problem noted awhile back that pg_dump may fail for foreign-key
constraints on user-defined types when the required operators aren't in the
search path.  This also means that the former warning condition about "foreign
key constraint will require costly sequential scans" is gone: if the
comparison condition isn't indexable then we'll reject the constraint
entirely. All per past discussions.

Along the way, make the RI triggers look into pg_constraint for their
information, instead of using pg_trigger.tgargs; and get rid of the always
error-prone fixed-size string buffers in ri_triggers.c in favor of building up
the RI queries in StringInfo buffers.

initdb forced due to columns added to pg_constraint and pg_trigger.
This commit is contained in:
Tom Lane
2007-02-14 01:58:58 +00:00
parent 65e2f55031
commit 7bddca3450
33 changed files with 1731 additions and 1665 deletions
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3
doc/src/sgml/trigger.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.49 2007/02/01 00:28:18 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.50 2007/02/14 01:58:56 tgl Exp $ -->
<chapter id="triggers">
<title>Triggers</title>
@@ -467,6 +467,7 @@ typedef struct Trigger
bool tgenabled;
bool tgisconstraint;
Oid tgconstrrelid;
Oid tgconstraint;
bool tgdeferrable;
bool tginitdeferred;
int16 tgnargs;