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Fix potential platform dependence in gist regression test.

The results of the KNN-search test cases were indeterminate, as they askedthe system to sort pairs of points that are exactly equidistant from thequery reference point. It's a bit surprising that we've seen noplatform-specific failures from this in the buildfarm. Perhaps IEEE-floatmath is well enough standardized that no such failures will ever occur onsupported platforms ... but since this entire regression test has yet to beshipped in any non-alpha release, that seems like an unduly optimisticassumption. Tweak the queries so that the correct output is uniquelydefined.(The other queries in this test are also underdetermined; but it looks likethey are regurgitating index rows in insertion order, so for the momentassume that that behavior is stable enough.)Per Greg Stark's experiments with VAX. Back-patch to 9.5 where this testscript was introduced.

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src/test/regress
- expected
  - gist.out
- sql
  - gist.sql

2 files changed

+12

-12

lines changed

`‎src/test/regress/expected/gist.out‎`

Lines changed: 8 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -61,16 +61,16 @@ select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5));`
`61`	`61`	`-- Also test an index-only knn-search`
`62`	`62`	`explain (costs off)`
`63`	`63`	`select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5))`
`64`		`-order by p <-> point(0.2, 0.2);`
	`64`	`+order by p <-> point(0.201, 0.201);`
`65`	`65`	`QUERY PLAN`
`66`	`66`	`--------------------------------------------------------`
`67`	`67`	`Index Only Scan using gist_tbl_point_index on gist_tbl`
`68`	`68`	`Index Cond: (p <@ '(0.5,0.5),(0,0)'::box)`
`69`		`- Order By: (p <-> '(0.2,0.2)'::point)`
	`69`	`+ Order By: (p <-> '(0.201,0.201)'::point)`
`70`	`70`	`(3 rows)`
`71`	`71`
`72`	`72`	`select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5))`
`73`		`-order by p <-> point(0.2, 0.2);`
	`73`	`+order by p <-> point(0.201, 0.201);`
`74`	`74`	`p`
`75`	`75`	`-------------`
`76`	`76`	`(0.2,0.2)`
`@@ -80,32 +80,32 @@ order by p <-> point(0.2, 0.2);`
`80`	`80`	`(0.1,0.1)`
`81`	`81`	`(0.35,0.35)`
`82`	`82`	`(0.05,0.05)`
`83`		`- (0,0)`
`84`	`83`	`(0.4,0.4)`
	`84`	`+ (0,0)`
`85`	`85`	`(0.45,0.45)`
`86`	`86`	`(0.5,0.5)`
`87`	`87`	`(11 rows)`
`88`	`88`
`89`	`89`	`-- Check commuted case as well`
`90`	`90`	`explain (costs off)`
`91`	`91`	`select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5))`
`92`		`-order by point(0.1, 0.1) <-> p;`
	`92`	`+order by point(0.101, 0.101) <-> p;`
`93`	`93`	`QUERY PLAN`
`94`	`94`	`--------------------------------------------------------`
`95`	`95`	`Index Only Scan using gist_tbl_point_index on gist_tbl`
`96`	`96`	`Index Cond: (p <@ '(0.5,0.5),(0,0)'::box)`
`97`		`- Order By: (p <-> '(0.1,0.1)'::point)`
	`97`	`+ Order By: (p <-> '(0.101,0.101)'::point)`
`98`	`98`	`(3 rows)`
`99`	`99`
`100`	`100`	`select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5))`
`101`		`-order by point(0.1, 0.1) <-> p;`
	`101`	`+order by point(0.101, 0.101) <-> p;`
`102`	`102`	`p`
`103`	`103`	`-------------`
`104`	`104`	`(0.1,0.1)`
`105`	`105`	`(0.15,0.15)`
`106`	`106`	`(0.05,0.05)`
`107`		`- (0,0)`
`108`	`107`	`(0.2,0.2)`
	`108`	`+ (0,0)`
`109`	`109`	`(0.25,0.25)`
`110`	`110`	`(0.3,0.3)`
`111`	`111`	`(0.35,0.35)`

`‎src/test/regress/sql/gist.sql‎`

Lines changed: 4 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -56,18 +56,18 @@ select p from gist_tbl where p <@ box(point(0,0), point(0.5, 0.5));`
`56`	`56`	`-- Also test an index-only knn-search`
`57`	`57`	`explain (costs off)`
`58`	`58`	`select pfrom gist_tblwhere p<@box(point(0,0),point(0.5,0.5))`
`59`		`-order by p<->point(0.2,0.2);`
	`59`	`+order by p<->point(0.201,0.201);`
`60`	`60`
`61`	`61`	`select pfrom gist_tblwhere p<@box(point(0,0),point(0.5,0.5))`
`62`		`-order by p<->point(0.2,0.2);`
	`62`	`+order by p<->point(0.201,0.201);`
`63`	`63`
`64`	`64`	`-- Check commuted case as well`
`65`	`65`	`explain (costs off)`
`66`	`66`	`select pfrom gist_tblwhere p<@box(point(0,0),point(0.5,0.5))`
`67`		`-order bypoint(0.1,0.1)<-> p;`
	`67`	`+order bypoint(0.101,0.101)<-> p;`
`68`	`68`
`69`	`69`	`select pfrom gist_tblwhere p<@box(point(0,0),point(0.5,0.5))`
`70`		`-order bypoint(0.1,0.1)<-> p;`
	`70`	`+order bypoint(0.101,0.101)<-> p;`
`71`	`71`
`72`	`72`	`dropindex gist_tbl_point_index;`
`73`	`73`

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Commitb8c9135

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2 files changed

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`‎src/test/regress/expected/gist.out‎`

`‎src/test/regress/sql/gist.sql‎`

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