Fix pg_dump's failure to honor dependencies of SQL functions.

A new-style SQL function can contain a parse-time dependency
on a unique index, much as views and matviews can (such cases
arise from GROUP BY and ON CONFLICT clauses, for example).
To dump and restore such a function successfully, pg_dump must
postpone the function until after the unique index is created,
which will happen in the post-data part of the dump.  Therefore
we have to remove the normal constraint that functions are
dumped in pre-data.  Add code similar to the existing logic
that handles this for matviews.  I added test cases for both
as well, since code coverage tests showed that we weren't
testing the matview logic.

Per report from Sami Imseih.  Back-patch to v14 where
new-style SQL functions came in.

Discussion: https://postgr.es/m/2C1933AB-C2F8-499B-9D18-4AC1882256A0@amazon.com

src/bin/pg_dump/pg_dump.c

@@ -6085,6 +6085,7 @@ getAggregates(Archive *fout, int *numAggs)
 						  agginfo[i].aggfn.argtypes,
 						  agginfo[i].aggfn.nargs);
 		}
+		agginfo[i].aggfn.postponed_def = false; /* might get set during sort */
 
 		/* Decide whether we want to dump it */
 		selectDumpableObject(&(agginfo[i].aggfn.dobj), fout);
@@ -6283,6 +6284,7 @@ getFuncs(Archive *fout, int *numFuncs)
 			parseOidArray(PQgetvalue(res, i, i_proargtypes),
 						  finfo[i].argtypes, finfo[i].nargs);
 		}
+		finfo[i].postponed_def = false; /* might get set during sort */
 
 		/* Decide whether we want to dump it */
 		selectDumpableObject(&(finfo[i].dobj), fout);
@@ -12168,7 +12170,8 @@ dumpFunc(Archive *fout, const FuncInfo *finfo)
 								  .namespace = finfo->dobj.namespace->dobj.name,
 								  .owner = finfo->rolname,
 								  .description = keyword,
-								  .section = SECTION_PRE_DATA,
+								  .section = finfo->postponed_def ?
+								  SECTION_POST_DATA : SECTION_PRE_DATA,
 								  .createStmt = q->data,
 								  .dropStmt = delqry->data));
 

src/bin/pg_dump/pg_dump.h

@@ -227,6 +227,7 @@ typedef struct _funcInfo
 	int			nargs;
 	Oid		   *argtypes;
 	Oid			prorettype;
+	bool		postponed_def;	/* function must be postponed into post-data */
 } FuncInfo;
 
 /* AggInfo is a superset of FuncInfo */

src/bin/pg_dump/pg_dump_sort.c

@@ -868,6 +868,28 @@ repairMatViewBoundaryMultiLoop(DumpableObject *boundaryobj,
 	}
 }
 
+/*
+ * If a function is involved in a multi-object loop, we can't currently fix
+ * that by splitting it into two DumpableObjects.  As a stopgap, we try to fix
+ * it by dropping the constraint that the function be dumped in the pre-data
+ * section.  This is sufficient to handle cases where a function depends on
+ * some unique index, as can happen if it has a GROUP BY for example.
+ */
+static void
+repairFunctionBoundaryMultiLoop(DumpableObject *boundaryobj,
+								DumpableObject *nextobj)
+{
+	/* remove boundary's dependency on object after it in loop */
+	removeObjectDependency(boundaryobj, nextobj->dumpId);
+	/* if that object is a function, mark it as postponed into post-data */
+	if (nextobj->objType == DO_FUNC)
+	{
+		FuncInfo   *nextinfo = (FuncInfo *) nextobj;
+
+		nextinfo->postponed_def = true;
+	}
+}
+
 /*
  * Because we make tables depend on their CHECK constraints, while there
  * will be an automatic dependency in the other direction, we need to break
@@ -1062,6 +1084,28 @@ repairDependencyLoop(DumpableObject **loop,
 		}
 	}
 
+	/* Indirect loop involving function and data boundary */
+	if (nLoop > 2)
+	{
+		for (i = 0; i < nLoop; i++)
+		{
+			if (loop[i]->objType == DO_FUNC)
+			{
+				for (j = 0; j < nLoop; j++)
+				{
+					if (loop[j]->objType == DO_PRE_DATA_BOUNDARY)
+					{
+						DumpableObject *nextobj;
+
+						nextobj = (j < nLoop - 1) ? loop[j + 1] : loop[0];
+						repairFunctionBoundaryMultiLoop(loop[j], nextobj);
+						return;
+					}
+				}
+			}
+		}
+	}
+
 	/* Table and CHECK constraint */
 	if (nLoop == 2 &&
 		loop[0]->objType == DO_TABLE &&

src/bin/pg_dump/t/002_pg_dump.pl

@@ -2490,6 +2490,27 @@ my %tests = (
 		},
 	},
 
+	'Check ordering of a function that depends on a primary key' => {
+		create_order => 41,
+		create_sql => '
+			CREATE TABLE dump_test.ordering_table (id int primary key, data int);
+			CREATE FUNCTION dump_test.ordering_func ()
+			RETURNS SETOF dump_test.ordering_table
+			LANGUAGE sql BEGIN ATOMIC
+			SELECT * FROM dump_test.ordering_table GROUP BY id; END;',
+		regexp => qr/^
+			\QALTER TABLE ONLY dump_test.ordering_table\E
+			\n\s+\QADD CONSTRAINT ordering_table_pkey PRIMARY KEY (id);\E
+			.*^
+			\QCREATE FUNCTION dump_test.ordering_func\E/xms,
+		like =>
+		  { %full_runs, %dump_test_schema_runs, section_post_data => 1, },
+		unlike => {
+			exclude_dump_test_schema => 1,
+			only_dump_measurement => 1,
+		},
+	},
+
 	'CREATE PROCEDURE dump_test.ptest1' => {
 		create_order => 41,
 		create_sql => 'CREATE PROCEDURE dump_test.ptest1(a int)
@@ -2732,6 +2753,25 @@ my %tests = (
 		},
 	},
 
+	'Check ordering of a matview that depends on a primary key' => {
+		create_order => 42,
+		create_sql => '
+			CREATE MATERIALIZED VIEW dump_test.ordering_view AS
+				SELECT * FROM dump_test.ordering_table GROUP BY id;',
+		regexp => qr/^
+			\QALTER TABLE ONLY dump_test.ordering_table\E
+			\n\s+\QADD CONSTRAINT ordering_table_pkey PRIMARY KEY (id);\E
+			.*^
+			\QCREATE MATERIALIZED VIEW dump_test.ordering_view AS\E
+			\n\s+\QSELECT id,\E/xms,
+		like =>
+		  { %full_runs, %dump_test_schema_runs, section_post_data => 1, },
+		unlike => {
+			exclude_dump_test_schema => 1,
+			only_dump_measurement => 1,
+		},
+	},
+
 	'CREATE POLICY p1 ON test_table' => {
 		create_order => 22,
 		create_sql => 'CREATE POLICY p1 ON dump_test.test_table