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

dyemanov · dyemanov · commit ec8a48d37ccd · 2024-09-23T18:06:44.000+03:00
diff --git a/src/jrd/optimizer/Optimizer.h b/src/jrd/optimizer/Optimizer.h
@@ -842,7 +842,7 @@ 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
`@@ -842,7 +842,7 @@ class InnerJoin : private Firebird::PermanentStorage`
`842`	`842`
`843`	`843`	`struct JoinedStreamInfo`
`844`	`844`	`{`
`845`		`- static const unsigned MAX_EQUI_MATCHES = 4;`
	`845`	`+ static const unsigned MAX_EQUI_MATCHES = 8;`
`846`	`846`
`847`	`847`	`void reset (StreamType num)`
`848`	`848`	`{`