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De-kludge contrib/btree_gin for collations.

Using DEFAULT_COLLATION_OID in the comparePartial functions was not onlya lame hack, but outright wrong, because the compare functions forcollation-aware types were already responding to the declared indexcollation. So comparePartial would have the wrong expectation aboutthe index's sort order, possibly leading to missing matches for prefixsearches.

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contrib/btree_gin
- btree_gin.c

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`‎contrib/btree_gin/btree_gin.c‎`

Lines changed: 1 addition & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,6 @@`
`7`	`7`
`8`	`8`	`#include"fmgr.h"`
`9`	`9`	`#include"access/skey.h"`
`10`		`-#include"catalog/pg_collation.h"`
`11`	`10`	`#include"utils/builtins.h"`
`12`	`11`	`#include"utils/bytea.h"`
`13`	`12`	`#include"utils/cash.h"`
`@@ -123,7 +122,7 @@ gin_compare_prefix_##type(PG_FUNCTION_ARGS)\`
`123`	`122`	`\`
`124`	`123`	`cmp = DatumGetInt32(DirectFunctionCall2Coll(\`
`125`	`124`	`TypeInfo_##type.typecmp,\`
`126`		`-DEFAULT_COLLATION_OID,\`
	`125`	`+PG_GET_COLLATION(),\`
`127`	`126`	`(data->strategy == BTLessStrategyNumber \|\|\`
`128`	`127`	`data->strategy == BTLessEqualStrategyNumber)\`
`129`	`128`	`? data->datum : a,\`

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Commit474ff21

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`‎contrib/btree_gin/btree_gin.c‎`

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