Resolved CORE-1482: Make optimizer to consider ORDER BY optimization …

…when making decision about join order. Also, improved (hopefully) cost calculation for navigational retrievals.
FirebirdSQL · Jan 5, 2014 · 15113ae · 15113ae
1 parent adef722
commit 15113ae
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Showing 7 changed files with 98 additions and 92 deletions.
diff --git a/src/dsql/BoolNodes.cpp b/src/dsql/BoolNodes.cpp
@@ -1650,6 +1650,9 @@ DmlNode* RseBoolNode::parse(thread_db* tdbb, MemoryPool& pool, CompilerScratch*
 	RseBoolNode* node = FB_NEW(pool) RseBoolNode(pool, blrOp);
 	node->rse = PAR_rse(tdbb, csb);
 
+	if (blrOp == blr_any || blrOp == blr_exists) // maybe for blr_unique as well?
+		node->rse->flags |= RseNode::FLAG_OPT_FIRST_ROWS;
+
 	if (csb->csb_currentForNode && csb->csb_currentForNode->parBlrBeginCnt <= 1)
 		node->parentForNode = csb->csb_currentForNode;