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Key: CORE-2659
Type: Bug Bug
Status: Closed Closed
Resolution: Fixed
Priority: Major Major
Assignee: Dmitry Yemanov
Reporter: Dmitry Yemanov
Votes: 0
Watchers: 0

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Firebird Core

Sub-optimal (not indexed) query plan for outer joins involving complex views

Created: 02/Oct/09 09:24 PM   Updated: 29/Aug/15 02:44 PM
Component/s: Engine
Affects Version/s: 2.5 Beta 1, 2.5 Beta 2
Fix Version/s: 2.5 RC1

QA Status: Not enough information

 Description  « Hide
Under some conditions (without a simple test case, unfortunately), if (a) some view contains unions/aggregations inside, (b) this view has expression based columns and (c) this view is used in outer joins with other streams and the join condition involves the view columns (expressions), then an outer join may be optimized badly.

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