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Add temporal FOREIGN KEY contraints

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Add PERIOD clause to foreign key constraint definitions.  This is
supported for range and multirange types.  Temporal foreign keys check
for range containment instead of equality.

This feature matches the behavior of the SQL standard temporal foreign
keys, but it works on PostgreSQL's native ranges instead of SQL's
"periods", which don't exist in PostgreSQL (yet).

Reference actions ON {UPDATE,DELETE} {CASCADE,SET NULL,SET DEFAULT}
are not supported yet.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2024-03-24 07:37:13 +01:00
parent b1fe8efdf1
commit 34768ee361
16 changed files with 2790 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
src/backend/parser/gram.y
View File

@@ -523,12 +523,13 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
SetResetClause FunctionSetResetClause
%type <node> TableElement TypedTableElement ConstraintElem TableFuncElement
%type <node> columnDef columnOptions
%type <node> columnDef columnOptions optionalPeriodName
%type <defelt> def_elem reloption_elem old_aggr_elem operator_def_elem
%type <node> def_arg columnElem where_clause where_or_current_clause
a_expr b_expr c_expr AexprConst indirection_el opt_slice_bound
columnref in_expr having_clause func_table xmltable array_expr
OptWhereClause operator_def_arg
%type <list> opt_column_and_period_list
%type <list> rowsfrom_item rowsfrom_list opt_col_def_list
%type <boolean> opt_ordinality opt_without_overlaps
%type <list> ExclusionConstraintList ExclusionConstraintElem
@@ -755,7 +756,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
OVER OVERLAPS OVERLAY OVERRIDING OWNED OWNER
PARALLEL PARAMETER PARSER PARTIAL PARTITION PASSING PASSWORD
PLACING PLANS POLICY
PERIOD PLACING PLANS POLICY
POSITION PRECEDING PRECISION PRESERVE PREPARE PREPARED PRIMARY
PRIOR PRIVILEGES PROCEDURAL PROCEDURE PROCEDURES PROGRAM PUBLICATION
@@ -4237,21 +4238,31 @@ ConstraintElem:
NULL, yyscanner);
$$ = (Node *) n;
}
| FOREIGN KEY '(' columnList ')' REFERENCES qualified_name
opt_column_list key_match key_actions ConstraintAttributeSpec
| FOREIGN KEY '(' columnList optionalPeriodName ')' REFERENCES qualified_name
opt_column_and_period_list key_match key_actions ConstraintAttributeSpec
{
Constraint *n = makeNode(Constraint);
n->contype = CONSTR_FOREIGN;
n->location = @1;
n->pktable = $7;
n->pktable = $8;
n->fk_attrs = $4;
n->pk_attrs = $8;
n->fk_matchtype = $9;
n->fk_upd_action = ($10)->updateAction->action;
n->fk_del_action = ($10)->deleteAction->action;
n->fk_del_set_cols = ($10)->deleteAction->cols;
processCASbits($11, @11, "FOREIGN KEY",
if ($5)
{
n->fk_attrs = lappend(n->fk_attrs, $5);
n->fk_with_period = true;
}
n->pk_attrs = linitial($9);
if (lsecond($9))
{
n->pk_attrs = lappend(n->pk_attrs, lsecond($9));
n->pk_with_period = true;
}
n->fk_matchtype = $10;
n->fk_upd_action = ($11)->updateAction->action;
n->fk_del_action = ($11)->deleteAction->action;
n->fk_del_set_cols = ($11)->deleteAction->cols;
processCASbits($12, @12, "FOREIGN KEY",
&n->deferrable, &n->initdeferred,
&n->skip_validation, NULL,
yyscanner);
@@ -4279,6 +4290,16 @@ columnList:
| columnList ',' columnElem { $$ = lappend($1, $3); }
;
optionalPeriodName:
',' PERIOD columnElem { $$ = $3; }
| /*EMPTY*/ { $$ = NULL; }
;
opt_column_and_period_list:
'(' columnList optionalPeriodName ')' { $$ = list_make2($2, $3); }
| /*EMPTY*/ { $$ = list_make2(NIL, NULL); }
;
columnElem: ColId
{
$$ = (Node *) makeString($1);
@@ -17491,6 +17512,7 @@ unreserved_keyword:
| PARTITION
| PASSING
| PASSWORD
| PERIOD
| PLANS
| POLICY
| PRECEDING
@@ -18108,6 +18130,7 @@ bare_label_keyword:
| PARTITION
| PASSING
| PASSWORD
| PERIOD
| PLACING
| PLANS
| POLICY