More float test and portability fixes.

Avoid assuming exact results in tstypes test; some platforms vary.
(per buildfarm members eulachon, danio, lapwing)

Avoid dubious usage (inherited from upstream) of bool parameters to
copy_special_str, to see if this fixes the mac/ppc failures (per
buildfarm members prariedog and locust). (Isolated test programs on a
ppc mac don't seem to show any other cause that would explain them.)

src/test/regress/expected/tstypes.out

@@ -1,3 +1,5 @@
+-- deal with numeric instability of ts_rank
+SET extra_float_digits = 0;
 --Base tsvector test
 SELECT '1'::tsvector;
  tsvector 
@@ -787,57 +789,57 @@ select to_tsvector('simple', '') @@ '!foo' AS "true";
 
 --ranking
 SELECT ts_rank(' a:1 s:2C d g'::tsvector, 'a | s');
-   ts_rank   
--------------
- 0.091189064
+  ts_rank  
+-----------
+ 0.0911891
 (1 row)
 
 SELECT ts_rank(' a:1 sa:2C d g'::tsvector, 'a | s');
-   ts_rank   
--------------
- 0.030396355
+  ts_rank  
+-----------
+ 0.0303964
 (1 row)
 
 SELECT ts_rank(' a:1 sa:2C d g'::tsvector, 'a | s:*');
-   ts_rank   
--------------
- 0.091189064
+  ts_rank  
+-----------
+ 0.0911891
 (1 row)
 
 SELECT ts_rank(' a:1 sa:2C d g'::tsvector, 'a | sa:*');
-   ts_rank   
--------------
- 0.091189064
+  ts_rank  
+-----------
+ 0.0911891
 (1 row)
 
 SELECT ts_rank(' a:1 s:2B d g'::tsvector, 'a | s');
-  ts_rank   
-------------
- 0.15198177
+ ts_rank  
+----------
+ 0.151982
 (1 row)
 
 SELECT ts_rank(' a:1 s:2 d g'::tsvector, 'a | s');
-  ts_rank   
-------------
- 0.06079271
+  ts_rank  
+-----------
+ 0.0607927
 (1 row)
 
 SELECT ts_rank(' a:1 s:2C d g'::tsvector, 'a & s');
-  ts_rank   
-------------
- 0.14015312
+ ts_rank  
+----------
+ 0.140153
 (1 row)
 
 SELECT ts_rank(' a:1 s:2B d g'::tsvector, 'a & s');
-  ts_rank   
-------------
- 0.19820644
+ ts_rank  
+----------
+ 0.198206
 (1 row)
 
 SELECT ts_rank(' a:1 s:2 d g'::tsvector, 'a & s');
-  ts_rank   
-------------
- 0.09910322
+  ts_rank  
+-----------
+ 0.0991032
 (1 row)
 
 SELECT ts_rank_cd(' a:1 s:2C d g'::tsvector, 'a | s');
@@ -885,7 +887,7 @@ SELECT ts_rank_cd(' a:1 s:2 d g'::tsvector, 'a | s');
 SELECT ts_rank_cd(' a:1 s:2C d g'::tsvector, 'a & s');
  ts_rank_cd 
 ------------
- 0.13333334
+   0.133333
 (1 row)
 
 SELECT ts_rank_cd(' a:1 s:2B d g'::tsvector, 'a & s');
@@ -903,13 +905,13 @@ SELECT ts_rank_cd(' a:1 s:2 d g'::tsvector, 'a & s');
 SELECT ts_rank_cd(' a:1 s:2A d g'::tsvector, 'a <-> s');
  ts_rank_cd 
 ------------
- 0.18181819
+   0.181818
 (1 row)
 
 SELECT ts_rank_cd(' a:1 s:2C d g'::tsvector, 'a <-> s');
  ts_rank_cd 
 ------------
- 0.13333334
+   0.133333
 (1 row)
 
 SELECT ts_rank_cd(' a:1 s:2 d g'::tsvector, 'a <-> s');
@@ -927,13 +929,13 @@ SELECT ts_rank_cd(' a:1 s:2 d:2A g'::tsvector, 'a <-> s');
 SELECT ts_rank_cd(' a:1 s:2,3A d:2A g'::tsvector, 'a <2> s:A');
  ts_rank_cd 
 ------------
- 0.09090909
+  0.0909091
 (1 row)
 
 SELECT ts_rank_cd(' a:1 b:2 s:3A d:2A g'::tsvector, 'a <2> s:A');
  ts_rank_cd 
 ------------
- 0.09090909
+  0.0909091
 (1 row)
 
 SELECT ts_rank_cd(' a:1 sa:2D sb:2A g'::tsvector, 'a <-> s:*');

src/test/regress/sql/tstypes.sql

@@ -1,3 +1,6 @@
+-- deal with numeric instability of ts_rank
+SET extra_float_digits = 0;
+
 --Base tsvector test
 
 SELECT '1'::tsvector;