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Add ATAlterConstraint struct for ALTER .. CONSTRAINT

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Replace the use of Constraint with a new ATAlterConstraint struct, which
allows us to pass additional information.  No functionality is added by
this commit.  This is necessary for future work that allows altering
constraints in other ways.

I (Álvaro) took the liberty of restructuring the code for ALTER
CONSTRAINT beyond what Amul did.  The original coding before Amul's
patch was unnecessarily baroque, and this change makes things simpler
by removing one level of subroutine.  Also, partly remove the assumption
that only partitioned tables are relevant (by passing sensible 'recurse'
arguments) and no longer ignore whether ONLY was specified.  I say
'partly' because the current coding only walks down via the 'conparentid'
relationship, which is only used for partitioned tables; but future
patches could handle ONLY or not for other types of constraint changes
for legacy inheritance trees too.

Author: Amul Sul <sulamul@gmail.com>
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CAAJ_b94bfgPV-8Mw_HwSBeheVwaK9=5s+7+KbBj_NpwXQFgDGg@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-02-19 13:06:13 +01:00
parent e983ee9380
commit 80d7f99049
4 changed files with 104 additions and 107 deletions
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4
src/backend/parser/gram.y
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@ -2657,12 +2657,12 @@ alter_table_cmd:
| ALTER CONSTRAINT name ConstraintAttributeSpec
{
AlterTableCmd *n = makeNode(AlterTableCmd);
Constraint *c = makeNode(Constraint);
ATAlterConstraint *c = makeNode(ATAlterConstraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->contype = CONSTR_FOREIGN; /* others not supported, yet */
c->conname = $3;
c->alterDeferrability = true;
processCASbits($4, @4, "ALTER CONSTRAINT statement",
&c->deferrable,
&c->initdeferred,