Fix #8250: Bad performance on simple three-way join over the same set of fields

dyemanov · dyemanov · commit e1ffa20e973b · 2024-09-23T18:09:02.000+03:00
diff --git a/src/jrd/optimizer/Optimizer.h b/src/jrd/optimizer/Optimizer.h
@@ -844,7 +844,7 @@ class InnerJoin : private Firebird::PermanentStorage
 
 	struct JoinedStreamInfo
 	{
-		static const unsigned MAX_EQUI_MATCHES = 4;
+		static const unsigned MAX_EQUI_MATCHES = 8;
 
 		void reset (StreamType num)
 		{

Original file line number	Diff line number	Diff line change
`@@ -844,7 +844,7 @@ class InnerJoin : private Firebird::PermanentStorage`
`844`	`844`
`845`	`845`	`struct JoinedStreamInfo`
`846`	`846`	`{`
`847`		`- static const unsigned MAX_EQUI_MATCHES = 4;`
	`847`	`+ static const unsigned MAX_EQUI_MATCHES = 8;`
`848`	`848`
`849`	`849`	`void reset (StreamType num)`
`850`	`850`	`{`