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Fix example plan in optimizer/README.

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Joining three tables only takes two join nodes.  I think when I (tgl)
wrote this, I was envisioning possible additional joins; but since the
example doesn't show any fourth table, it's just confusing to write
a third join node.

Etsuro Fujita

Discussion: https://postgr.es/m/e6cfbaa3-af02-1abc-c25e-8fa5c6bc4e21@lab.ntt.co.jp
This commit is contained in:
Tom Lane 2017-01-23 09:38:36 -05:00
parent c0ef456b97
commit 3c821466ab
1 changed files with 2 additions and 3 deletions
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src/backend/optimizer/README
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@ -757,7 +757,6 @@ to create a plan like
-> Seq Scan on SmallTable1 A -> Seq Scan on SmallTable1 A
NestLoop NestLoop
-> Seq Scan on SmallTable2 B -> Seq Scan on SmallTable2 B
NestLoop
-> Index Scan using XYIndex on LargeTable C -> Index Scan using XYIndex on LargeTable C
Index Condition: C.X = A.AID and C.Y = B.BID Index Condition: C.X = A.AID and C.Y = B.BID