Bug#21238614 ST_BUFFER(LINESTRING) MAY PRODUCE AN INVALID POLYGON

Tweak the expected test results by use of regex to work around the differences
in the resulting cooridnates on various platforms.

Author: awulkiew

mysql-test/suite/gis/r/spatial_analysis_functions_buffer.result

@@ -301,9 +301,9 @@ GEOMETRYCOLLECTION(GEOMETRYCOLLECTION())
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(GEOMETRYCOLLECTION()))'), 100));
 ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(GEOMETRYCOLLECTION()))'), 100))
 GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(GEOMETRYCOLLECTION()))
-SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10));
-ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10))
-POLYGON((0 10.0000,-1.9509 9.8078,-3.8268 9.2387,-5.5557 8.3146,-7.0710 7.0710,-8.3146 5.5557,-9.2387 3.8268,-9.8078 1.9509,-10 7.65e-15,-9.8078 -1.9509,-9.2387 -3.8268,-8.3146 -5.5557,-7.0710 -7.0710,-5.5557 -8.3146,-3.8268 -9.2387,-1.9509 -9.8078,6.12e-16 -10,1.9509 -9.8078,3.8268 -9.2387,5.5557 -8.3146,7.0710 -7.0710,8.3146 -5.5557,9.2387 -3.8268,9.8078 -1.9509,10 0,11.9509 0.1921,13.8268 0.7612,15.5557 1.6853,17.0710 2.9289,18.3146 4.4442,19.2387 6.1731,19.8078 8.0490,20 10,19.8078 11.9509,19.2387 13.8268,18.3146 15.5557,17.0710 17.0710,15.5557 18.3146,13.8268 19.2387,11.9509 19.8078,10.0000 20,8.0490 19.8078,6.1731 19.2387,4.4442 18.3146,2.9289 17.0710,1.6853 15.5557,0.7612 13.8268,0.1921 11.9509,0 10.0000))
+SELECT ST_AREA(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10)) BETWEEN 568.21 AND 568.22;
+ST_AREA(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10)) BETWEEN 568.21 AND 568.22
+1
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10)))'), 5));
 ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10)))'), 5))
 MULTIPOLYGON(((5 0,4.9039 0.9754,4.6193 1.9134,4.1573 2.7778,3.5355 3.5355,2.7778 4.1573,1.9134 4.6193,0.9754 4.9039,1.24e-14 5,-0.9754 4.9039,-1.9134 4.6193,-2.7778 4.1573,-3.5355 3.5355,-4.1573 2.7778,-4.6193 1.9134,-4.9039 0.9754,-5 3.82e-15,-4.9039 -0.9754,-4.6193 -1.9134,-4.1573 -2.7778,-3.5355 -3.5355,-2.7778 -4.1573,-1.9134 -4.6193,-0.9754 -4.9039,3.06e-16 -5,0.9754 -4.9039,1.9134 -4.6193,2.7778 -4.1573,3.5355 -3.5355,4.1573 -2.7778,4.6193 -1.9134,4.9039 -0.9754,5 0)),((15 10,14.9039 10.9754,14.6193 11.9134,14.1573 12.7778,13.5355 13.5355,12.7778 14.1573,11.9134 14.6193,10.9754 14.9039,10.0000 15,9.0245 14.9039,8.0865 14.6193,7.2221 14.1573,6.4644 13.5355,5.8426 12.7778,5.3806 11.9134,5.0960 10.9754,5 10.0000,5.0960 9.0245,5.3806 8.0865,5.8426 7.2221,6.4644 6.4644,7.2221 5.8426,8.0865 5.3806,9.0245 5.0960,10 5,10.9754 5.0960,11.9134 5.3806,12.7778 5.8426,13.5355 6.4644,14.1573 7.2221,14.6193 8.0865,14.9039 9.0245,15 10)))
@@ -654,7 +654,7 @@ SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(0 0,5
 ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(0 0,5 5,10 10),'
                                                               'LINESTRING(0 0,-5 -5,-10 -10),'
                                                               'MULTILINESTRI
-POLYGON((4.1421 -10,10 -10,11.9509 -9.8078,13.8268 -9.2387,15.5557 -8.3146,17.0710 -7.0710,18.3146 -5.5557,19.2387 -3.8268,19.8078 -1.9509,20 0,19.8078 1.9509,19.2387 3.8268,18.6117 4.9999,19.2387 6.1731,19.8078 8.0490,20 9.9999,19.8078 11.9509,19.2387 13.8268,18.3146 15.5557,17.0710 17.0710,15.5557 18.3146,13.8268 19.2387,11.9509 19.8078,10.0000 20,8.0490 19.8078,6.1731 19.2387,4.4442 18.3146,2.9289 17.0710,-4.1421 10,-10 10,-11.9509 9.8078,-13.8268 9.2387,-15.5557 8.3146,-17.0710 7.0710,-18.3146 5.5557,-19.2387 3.8268,-19.8078 1.9509,-20 7.65e-15,-19.8078 -1.9509,-19.2387 -3.8268,-18.6117 -5.0000,-19.2387 -6.1731,-19.8078 -8.0490,-20 -9.9999,-19.8078 -11.9509,-19.2387 -13.8268,-18.3146 -15.5557,-17.0710 -17.0710,-15.5557 -18.3146,-13.8268 -19.2387,-11.9509 -19.8078,-10 -20,-8.0490 -19.8078,-6.1731 -19.2387,-4.4442 -18.3146,-2.9289 -17.0710,4.1421 -10))
+POLYGON((4.1421 -10,10 -10,11.9509 -9.8078,13.8268 -9.2387,15.5557 -8.3146,17.0710 -7.0710,18.3146 -5.5557,19.2387 -3.8268,19.8078 -1.9509,20 0,19.8078 1.9509,19.2387 3.8268,18.6117 5.0000,19.2387 6.1731,19.8078 8.0490,20 9.9999,19.8078 11.9509,19.2387 13.8268,18.3146 15.5557,17.0710 17.0710,15.5557 18.3146,13.8268 19.2387,11.9509 19.8078,10.0000 20,8.0490 19.8078,6.1731 19.2387,4.4442 18.3146,2.9289 17.0710,-4.1421 10,-10 10,-11.9509 9.8078,-13.8268 9.2387,-15.5557 8.3146,-17.0710 7.0710,-18.3146 5.5557,-19.2387 3.8268,-19.8078 1.9509,-20 7.65e-15,-19.8078 -1.9509,-19.2387 -3.8268,-18.6117 -5.0000,-19.2387 -6.1731,-19.8078 -8.0490,-20 -9.9999,-19.8078 -11.9509,-19.2387 -13.8268,-18.3146 -15.5557,-17.0710 -17.0710,-15.5557 -18.3146,-13.8268 -19.2387,-11.9509 -19.8078,-10 -20,-8.0490 -19.8078,-6.1731 -19.2387,-4.4442 -18.3146,-2.9289 -17.0710,4.1421 -10))
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POLYGON((0 0,0 5,5 5,5 0,0 0)),'
                                                               'MULTIPOLYGON(((0 0,2 2,4 0,0 0)),((3 3,3 5,5 5,5 3,3 3))))'), 10, ST_BUFFER_STRATEGY('join_round', 10)));
 ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POLYGON((0 0,0 5,5 5,5 0,0 0)),'

mysql-test/suite/gis/t/spatial_analysis_functions_buffer.test

@@ -335,8 +335,10 @@ SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTIO
 --replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(GEOMETRYCOLLECTION()))'), 100));
 
---replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/
-SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10));
+# area check used because of the differences on various platforms
+#--replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/
+#SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10));
+SELECT ST_AREA(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10))'), 10)) BETWEEN 568.21 AND 568.22; 
 
 --replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION(POINT(10 10),MULTIPOINT(0 0,10 10)))'), 5));
@@ -680,7 +682,7 @@ SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(MULTIPOLYGON(((0
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(0 0,5 5,10 10),'
                                                               'MULTILINESTRING((0 0,10 10)))'), 10, ST_BUFFER_STRATEGY('join_round', 10)));
 
---replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/
+--replace_regex /([0-9]+\.[0-9]{4})[0-9]*/\1/ /([0-9]*\.[0-9]{2})[0-9]*(e[-+]*[0-9]+)/\1\2/ /(4.9999)/5.0000/
 SELECT ST_ASTEXT(ST_BUFFER(ST_GEOMFROMTEXT('GEOMETRYCOLLECTION(LINESTRING(0 0,5 5,10 10),'
                                                               'LINESTRING(0 0,-5 -5,-10 -10),'
                                                               'MULTILINESTRING((0 0,5 5,10 10)),'