Remove unused functions in regress.c.

This patch removes five functions that presumably were once used in the
regression tests, but haven't been so used in many years.  Nonetheless
we've been wasting maintenance effort on them (e.g., by converting them
to V1 function protocol).  I see no reason to think that reviving them
would add any useful test coverage, so drop 'em.

In passing, mark regress_lseg_construct static, since it's not called
from outside this file.

Discussion: https://postgr.es/m/29322.1519701006@sss.pgh.pa.us

src/test/regress/expected/triggers.out

@@ -119,40 +119,6 @@ SELECT trigger_name, event_manipulation, event_object_schema, event_object_table
 DROP TABLE pkeys;
 DROP TABLE fkeys;
 DROP TABLE fkeys2;
--- -- I've disabled the funny_dup17 test because the new semantics
--- -- of AFTER ROW triggers, which get now fired at the end of a
--- -- query always, cause funny_dup17 to enter an endless loop.
--- --
--- --      Jan
---
--- create table dup17 (x int4);
---
--- create trigger dup17_before
--- 	before insert on dup17
--- 	for each row
--- 	execute procedure
--- 	funny_dup17 ()
--- ;
---
--- insert into dup17 values (17);
--- select count(*) from dup17;
--- insert into dup17 values (17);
--- select count(*) from dup17;
---
--- drop trigger dup17_before on dup17;
---
--- create trigger dup17_after
--- 	after insert on dup17
--- 	for each row
--- 	execute procedure
--- 	funny_dup17 ()
--- ;
--- insert into dup17 values (13);
--- select count(*) from dup17 where x = 13;
--- insert into dup17 values (13);
--- select count(*) from dup17 where x = 13;
---
--- DROP TABLE dup17;
 create sequence ttdummy_seq increment 10 start 0 minvalue 0;
 create table tttest (
 	price_id	int4,

src/test/regress/input/create_function_1.source

@@ -37,11 +37,6 @@ CREATE FUNCTION autoinc ()
 	AS '@libdir@/autoinc@DLSUFFIX@'
 	LANGUAGE C;
 
-CREATE FUNCTION funny_dup17 ()
-        RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
-        LANGUAGE C;
-
 CREATE FUNCTION ttdummy ()
         RETURNS trigger
         AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/input/create_function_2.source

@@ -72,11 +72,6 @@ CREATE FUNCTION overpaid(emp)
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT;
 
-CREATE FUNCTION boxarea(box)
-   RETURNS float8
-   AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C STRICT;
-
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
    AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/output/create_function_1.source

@@ -35,10 +35,6 @@ CREATE FUNCTION autoinc ()
 	RETURNS trigger
 	AS '@libdir@/autoinc@DLSUFFIX@'
 	LANGUAGE C;
-CREATE FUNCTION funny_dup17 ()
-        RETURNS trigger
-        AS '@libdir@/regress@DLSUFFIX@'
-        LANGUAGE C;
 CREATE FUNCTION ttdummy ()
         RETURNS trigger
         AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/output/create_function_2.source

@@ -55,10 +55,6 @@ CREATE FUNCTION overpaid(emp)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'
    LANGUAGE C STRICT;
-CREATE FUNCTION boxarea(box)
-   RETURNS float8
-   AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C STRICT;
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
    AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/regress.c

@@ -43,120 +43,11 @@
 #define RDELIM			')'
 #define DELIM			','
 
-extern PATH *poly2path(POLYGON *poly);
-extern void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
+static void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
 
 PG_MODULE_MAGIC;
 
 
-/*
- * Distance from a point to a path
- */
-PG_FUNCTION_INFO_V1(regress_dist_ptpath);
-
-Datum
-regress_dist_ptpath(PG_FUNCTION_ARGS)
-{
-	Point	   *pt = PG_GETARG_POINT_P(0);
-	PATH	   *path = PG_GETARG_PATH_P(1);
-	float8		result = 0.0;	/* keep compiler quiet */
-	float8		tmp;
-	int			i;
-	LSEG		lseg;
-
-	switch (path->npts)
-	{
-		case 0:
-			PG_RETURN_NULL();
-		case 1:
-			result = point_dt(pt, &path->p[0]);
-			break;
-		default:
-
-			/*
-			 * the distance from a point to a path is the smallest distance
-			 * from the point to any of its constituent segments.
-			 */
-			Assert(path->npts > 1);
-			for (i = 0; i < path->npts - 1; ++i)
-			{
-				regress_lseg_construct(&lseg, &path->p[i], &path->p[i + 1]);
-				tmp = DatumGetFloat8(DirectFunctionCall2(dist_ps,
-														 PointPGetDatum(pt),
-														 LsegPGetDatum(&lseg)));
-				if (i == 0 || tmp < result)
-					result = tmp;
-			}
-			break;
-	}
-	PG_RETURN_FLOAT8(result);
-}
-
-/*
- * this essentially does a cartesian product of the lsegs in the
- * two paths, and finds the min distance between any two lsegs
- */
-PG_FUNCTION_INFO_V1(regress_path_dist);
-
-Datum
-regress_path_dist(PG_FUNCTION_ARGS)
-{
-	PATH	   *p1 = PG_GETARG_PATH_P(0);
-	PATH	   *p2 = PG_GETARG_PATH_P(1);
-	bool		have_min = false;
-	float8		min = 0.0;		/* initialize to keep compiler quiet */
-	float8		tmp;
-	int			i,
-				j;
-	LSEG		seg1,
-				seg2;
-
-	for (i = 0; i < p1->npts - 1; i++)
-	{
-		for (j = 0; j < p2->npts - 1; j++)
-		{
-			regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
-			regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);
-
-			tmp = DatumGetFloat8(DirectFunctionCall2(lseg_distance,
-													 LsegPGetDatum(&seg1),
-													 LsegPGetDatum(&seg2)));
-			if (!have_min || tmp < min)
-			{
-				min = tmp;
-				have_min = true;
-			}
-		}
-	}
-
-	if (!have_min)
-		PG_RETURN_NULL();
-
-	PG_RETURN_FLOAT8(min);
-}
-
-PATH *
-poly2path(POLYGON *poly)
-{
-	int			i;
-	char	   *output = (char *) palloc(2 * (P_MAXDIG + 1) * poly->npts + 64);
-	char		buf[2 * (P_MAXDIG) + 20];
-
-	sprintf(output, "(1, %*d", P_MAXDIG, poly->npts);
-
-	for (i = 0; i < poly->npts; i++)
-	{
-		snprintf(buf, sizeof(buf), ",%*g,%*g",
-				 P_MAXDIG, poly->p[i].x, P_MAXDIG, poly->p[i].y);
-		strcat(output, buf);
-	}
-
-	snprintf(buf, sizeof(buf), "%c", RDELIM);
-	strcat(output, buf);
-	return DatumGetPathP(DirectFunctionCall1(path_in,
-											 CStringGetDatum(output)));
-}
-
 /* return the point where two paths intersect, or NULL if no intersection. */
 PG_FUNCTION_INFO_V1(interpt_pp);
 
@@ -201,7 +92,7 @@ interpt_pp(PG_FUNCTION_ARGS)
 
 
 /* like lseg_construct, but assume space already allocated */
-void
+static void
 regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2)
 {
 	lseg->p[0].x = pt1->x;
@@ -291,20 +182,6 @@ pt_in_widget(PG_FUNCTION_ARGS)
 	PG_RETURN_BOOL(point_dt(point, &widget->center) < widget->radius);
 }
 
-PG_FUNCTION_INFO_V1(boxarea);
-
-Datum
-boxarea(PG_FUNCTION_ARGS)
-{
-	BOX		   *box = PG_GETARG_BOX_P(0);
-	double		width,
-				height;
-
-	width = Abs(box->high.x - box->low.x);
-	height = Abs(box->high.y - box->low.y);
-	PG_RETURN_FLOAT8(width * height);
-}
-
 PG_FUNCTION_INFO_V1(reverse_name);
 
 Datum
@@ -327,123 +204,6 @@ reverse_name(PG_FUNCTION_ARGS)
 }
 
 
-static TransactionId fd17b_xid = InvalidTransactionId;
-static TransactionId fd17a_xid = InvalidTransactionId;
-static int	fd17b_level = 0;
-static int	fd17a_level = 0;
-static bool fd17b_recursion = true;
-static bool fd17a_recursion = true;
-
-PG_FUNCTION_INFO_V1(funny_dup17);
-
-Datum
-funny_dup17(PG_FUNCTION_ARGS)
-{
-	TriggerData *trigdata = (TriggerData *) fcinfo->context;
-	TransactionId *xid;
-	int		   *level;
-	bool	   *recursion;
-	Relation	rel;
-	TupleDesc	tupdesc;
-	HeapTuple	tuple;
-	char	   *query,
-			   *fieldval,
-			   *fieldtype;
-	char	   *when;
-	uint64		inserted;
-	int			selected = 0;
-	int			ret;
-
-	if (!CALLED_AS_TRIGGER(fcinfo))
-		elog(ERROR, "funny_dup17: not fired by trigger manager");
-
-	tuple = trigdata->tg_trigtuple;
-	rel = trigdata->tg_relation;
-	tupdesc = rel->rd_att;
-	if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
-	{
-		xid = &fd17b_xid;
-		level = &fd17b_level;
-		recursion = &fd17b_recursion;
-		when = "BEFORE";
-	}
-	else
-	{
-		xid = &fd17a_xid;
-		level = &fd17a_level;
-		recursion = &fd17a_recursion;
-		when = "AFTER ";
-	}
-
-	if (!TransactionIdIsCurrentTransactionId(*xid))
-	{
-		*xid = GetCurrentTransactionId();
-		*level = 0;
-		*recursion = true;
-	}
-
-	if (*level == 17)
-	{
-		*recursion = false;
-		return PointerGetDatum(tuple);
-	}
-
-	if (!(*recursion))
-		return PointerGetDatum(tuple);
-
-	(*level)++;
-
-	SPI_connect();
-
-	fieldval = SPI_getvalue(tuple, tupdesc, 1);
-	fieldtype = SPI_gettype(tupdesc, 1);
-
-	query = (char *) palloc(100 + NAMEDATALEN * 3 +
-							strlen(fieldval) + strlen(fieldtype));
-
-	sprintf(query, "insert into %s select * from %s where %s = '%s'::%s",
-			SPI_getrelname(rel), SPI_getrelname(rel),
-			SPI_fname(tupdesc, 1),
-			fieldval, fieldtype);
-
-	if ((ret = SPI_exec(query, 0)) < 0)
-		elog(ERROR, "funny_dup17 (fired %s) on level %3d: SPI_exec (insert ...) returned %d",
-			 when, *level, ret);
-
-	inserted = SPI_processed;
-
-	sprintf(query, "select count (*) from %s where %s = '%s'::%s",
-			SPI_getrelname(rel),
-			SPI_fname(tupdesc, 1),
-			fieldval, fieldtype);
-
-	if ((ret = SPI_exec(query, 0)) < 0)
-		elog(ERROR, "funny_dup17 (fired %s) on level %3d: SPI_exec (select ...) returned %d",
-			 when, *level, ret);
-
-	if (SPI_processed > 0)
-	{
-		selected = DatumGetInt32(DirectFunctionCall1(int4in,
-													 CStringGetDatum(SPI_getvalue(
-																				  SPI_tuptable->vals[0],
-																				  SPI_tuptable->tupdesc,
-																				  1
-																				  ))));
-	}
-
-	elog(DEBUG4, "funny_dup17 (fired %s) on level %3d: " UINT64_FORMAT "/%d tuples inserted/selected",
-		 when, *level, inserted, selected);
-
-	SPI_finish();
-
-	(*level)--;
-
-	if (*level == 0)
-		*xid = InvalidTransactionId;
-
-	return PointerGetDatum(tuple);
-}
-
 #define TTDUMMY_INFINITY	999999
 
 static SPIPlanPtr splan = NULL;

src/test/regress/sql/triggers.sql

@@ -103,41 +103,6 @@ DROP TABLE pkeys;
 DROP TABLE fkeys;
 DROP TABLE fkeys2;
 
--- -- I've disabled the funny_dup17 test because the new semantics
--- -- of AFTER ROW triggers, which get now fired at the end of a
--- -- query always, cause funny_dup17 to enter an endless loop.
--- --
--- --      Jan
---
--- create table dup17 (x int4);
---
--- create trigger dup17_before
--- 	before insert on dup17
--- 	for each row
--- 	execute procedure
--- 	funny_dup17 ()
--- ;
---
--- insert into dup17 values (17);
--- select count(*) from dup17;
--- insert into dup17 values (17);
--- select count(*) from dup17;
---
--- drop trigger dup17_before on dup17;
---
--- create trigger dup17_after
--- 	after insert on dup17
--- 	for each row
--- 	execute procedure
--- 	funny_dup17 ()
--- ;
--- insert into dup17 values (13);
--- select count(*) from dup17 where x = 13;
--- insert into dup17 values (13);
--- select count(*) from dup17 where x = 13;
---
--- DROP TABLE dup17;
-
 create sequence ttdummy_seq increment 10 start 0 minvalue 0;
 
 create table tttest (