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Fix masking of SP-GiST pages during xlog consistency check

spg_mask() didn't take into account that pd_lower equal to SizeOfPageHeaderDatais still valid value. This commit fixes that. Backpatch to 11, wherespg_mask() pg_lower check was introduced.Reported-by: Michael PaquierDiscussion:https://postgr.es/m/20200615131405.GM52676%40paquier.xyzBackpatch-through: 11

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src/backend/access/spgist
- spgxlog.c

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`‎src/backend/access/spgist/spgxlog.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1043,6 +1043,6 @@ spg_mask(char *pagedata, BlockNumber blkno)`
`1043`	`1043`	`* Mask the unused space, but only if the page's pd_lower appears to have`
`1044`	`1044`	`* been set correctly.`
`1045`	`1045`	`*/`
`1046`		`-if (pagehdr->pd_lower>SizeOfPageHeaderData)`
	`1046`	`+if (pagehdr->pd_lower >=SizeOfPageHeaderData)`
`1047`	`1047`	`mask_unused_space(page);`
`1048`	`1048`	`}`

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Commit3f88e2d

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`‎src/backend/access/spgist/spgxlog.c‎`

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