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Fix thinkos in BRIN summarization

The previous commit contained a thinko that made a single-rangesummarization request process from there to end of table. Fix bysetting the correct end range point. Per buildfarm.

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src/backend/access/brin
- brin.c

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`‎src/backend/access/brin/brin.c`

Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1292,8 +1292,11 @@ brinsummarize(Relation index, Relation heapRel, BlockNumber pageRange,`
`1292`	`1292`	`if (pageRange==BRIN_ALL_BLOCKRANGES)`
`1293`	`1293`	`startBlk=0;`
`1294`	`1294`	`else`
	`1295`	`+{`
`1295`	`1296`	`startBlk= (pageRange /pagesPerRange)*pagesPerRange;`
`1296`		`-if (startBlk >=heapNumBlocks)`
	`1297`	`+heapNumBlocks=Min(heapNumBlocks,startBlk+pagesPerRange);`
	`1298`	`+}`
	`1299`	`+if (startBlk>heapNumBlocks)`
`1297`	`1300`	`{`
`1298`	`1301`	`/* Nothing to do if start point is beyond end of table */`
`1299`	`1302`	`brinRevmapTerminate(revmap);`

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Commit1b89056

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`‎src/backend/access/brin/brin.c`

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