From 22d0eebfef780b21c4e5a16966eff59fb7a9b9d6 Mon Sep 17 00:00:00 2001 From: Peter Eisentraut Date: Thu, 6 Aug 2026 10:23:44 +0200 Subject: [PATCH] Report duplicate property and label names with a proper error Adding a property with the same name multiple times to a label on an element, either within a single PROPERTIES clause or across statements via ALTER PROPERTY GRAPH ... ADD PROPERTIES, previously failed with a unique-index violation on pg_propgraph_label_property. The same class of bug existed for labels: listing the same label multiple times on one element in CREATE PROPERTY GRAPH, or adding a label to an element that already has it via ALTER PROPERTY GRAPH ... ADD LABEL, failed with a unique-index violation on pg_propgraph_element_label. Detect the duplicates up front and raise a friendlier error in both cases. For properties, the cross-statement duplicate is caught by a syscache probe before insertion. The in-clause duplicate could have been caught by the same probe if we issued a CommandCounterIncrement() between property inserts, but that forces a catalog invalidation per property purely to detect a condition we can check for free on the in-memory target list. The list-based check is only needed when the properties are listed explicitly; when they are derived from the table's attributes, names are already unique. For labels, a single syscache probe on pg_propgraph_element_label suffices for both the in-clause and cross-statement cases because insert_element_record() already issues CommandCounterIncrement() between successive label inserts. Author: Ashutosh Bapat Reported-by: Noah Misch Discussion: https://www.postgresql.org/message-id/flat/20260630173053.51.noahmisch%40microsoft.com --- src/backend/commands/propgraphcmds.c | 37 +++++++++++++++++-- .../expected/create_property_graph.out | 14 +++++++ .../regress/sql/create_property_graph.sql | 12 ++++++ 3 files changed, 60 insertions(+), 3 deletions(-) diff --git a/src/backend/commands/propgraphcmds.c b/src/backend/commands/propgraphcmds.c index c87c519b032..9c9f4f2b299 100644 --- a/src/backend/commands/propgraphcmds.c +++ b/src/backend/commands/propgraphcmds.c @@ -784,6 +784,13 @@ insert_label_record(Oid graphid, Oid peoid, const char *label) /* * Insert into pg_propgraph_element_label */ + if (SearchSysCacheExists2(PROPGRAPHELEMENTLABELELEMENTLABEL, + ObjectIdGetDatum(peoid), + ObjectIdGetDatum(labeloid))) + ereport(ERROR, + errcode(ERRCODE_DUPLICATE_OBJECT), + errmsg("label \"%s\" already exists", label)); + else { Relation rel; Datum values[Natts_pg_propgraph_element_label] = {0}; @@ -901,12 +908,30 @@ insert_property_records(Oid graphid, Oid ellabeloid, Oid pgerelid, const PropGra resolveTargetListUnknowns(pstate, tp); assign_expr_collations(pstate, (Node *) tp); - foreach(lc, tp) + /* + * When properties are derived from the table's attributes, names are + * already unique. Reject duplicate property names within an explicit + * PROPERTIES clause. Do this after transformTargetList() so that any + * names derived by transformTargetList() are considered. + */ + if (!properties->all) { - TargetEntry *te = lfirst_node(TargetEntry, lc); + List *seen = NIL; - insert_property_record(graphid, ellabeloid, pgerelid, te->resname, te->expr); + foreach_node(TargetEntry, te, tp) + { + String *name = makeString(te->resname); + + if (list_member(seen, name)) + ereport(ERROR, + errcode(ERRCODE_DUPLICATE_OBJECT), + errmsg("property \"%s\" specified more than once", te->resname)); + seen = lappend(seen, name); + } } + + foreach_node(TargetEntry, te, tp) + insert_property_record(graphid, ellabeloid, pgerelid, te->resname, te->expr); } /* @@ -1003,6 +1028,12 @@ insert_property_record(Oid graphid, Oid ellabeloid, Oid pgerelid, const char *pr /* * Insert into pg_propgraph_label_property */ + if (SearchSysCacheExists2(PROPGRAPHLABELPROP, ObjectIdGetDatum(ellabeloid), + ObjectIdGetDatum(propoid))) + ereport(ERROR, + errcode(ERRCODE_DUPLICATE_OBJECT), + errmsg("property \"%s\" already exists", propname)); + else { Relation rel; Datum values[Natts_pg_propgraph_label_property] = {0}; diff --git a/src/test/regress/expected/create_property_graph.out b/src/test/regress/expected/create_property_graph.out index 9a3cc6c13b2..646e5fed5e2 100644 --- a/src/test/regress/expected/create_property_graph.out +++ b/src/test/regress/expected/create_property_graph.out @@ -207,6 +207,20 @@ CREATE PROPERTY GRAPH gx ); DROP PROPERTY GRAPH gx; DROP TABLE t1x, t2x; +CREATE PROPERTY GRAPH gx + VERTEX TABLES ( + t1 KEY (a) LABEL l1 PROPERTIES (a AS p, a AS p) -- duplicate property on label + ); +ERROR: property "p" specified more than once +ALTER PROPERTY GRAPH g4 ALTER VERTEX TABLE t2 ALTER LABEL t2 ADD PROPERTIES (k * 2 AS i_j); -- duplicate property on label +ERROR: property "i_j" already exists +CREATE PROPERTY GRAPH gx + VERTEX TABLES ( + t1 KEY (a) LABEL l1 LABEL l1 -- duplicate label on element + ); +ERROR: label "l1" already exists +ALTER PROPERTY GRAPH g4 ALTER VERTEX TABLE t3 ADD LABEL t3l1 NO PROPERTIES; -- duplicate label on element +ERROR: label "t3l1" already exists CREATE PROPERTY GRAPH gx VERTEX TABLES ( t1 KEY (a) LABEL l1 PROPERTIES (a, a AS aa), diff --git a/src/test/regress/sql/create_property_graph.sql b/src/test/regress/sql/create_property_graph.sql index 1ee223809f3..b1a8d12a040 100644 --- a/src/test/regress/sql/create_property_graph.sql +++ b/src/test/regress/sql/create_property_graph.sql @@ -161,6 +161,18 @@ CREATE PROPERTY GRAPH gx DROP PROPERTY GRAPH gx; DROP TABLE t1x, t2x; +CREATE PROPERTY GRAPH gx + VERTEX TABLES ( + t1 KEY (a) LABEL l1 PROPERTIES (a AS p, a AS p) -- duplicate property on label + ); +ALTER PROPERTY GRAPH g4 ALTER VERTEX TABLE t2 ALTER LABEL t2 ADD PROPERTIES (k * 2 AS i_j); -- duplicate property on label + +CREATE PROPERTY GRAPH gx + VERTEX TABLES ( + t1 KEY (a) LABEL l1 LABEL l1 -- duplicate label on element + ); +ALTER PROPERTY GRAPH g4 ALTER VERTEX TABLE t3 ADD LABEL t3l1 NO PROPERTIES; -- duplicate label on element + CREATE PROPERTY GRAPH gx VERTEX TABLES ( t1 KEY (a) LABEL l1 PROPERTIES (a, a AS aa),