MySQL Bugs: #84514: Refactor accumulated Item properties into a bitset

Bug #84514	Refactor accumulated Item properties into a bitset
Submitted:	16 Jan 2017 11:03	Modified:	31 May 2017 21:52
Reporter:	Roy Lyseng	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Optimizer	Severity:	S3 (Non-critical)
Version:	8.0	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
There are a few properties of class Item that are accumulated from the leaf nodes of an Item tree up to the root node. These are the subquery and stored_program indicators and the sum-function indicators.
This refactoring collects these properties in a bitset which is acumulated in a single operation.
The main benefits of this refactoring is to provide
- uniform handling of all accumulated Item properties.
- Easy addition of new accumulated properties.
- More efficient processing, since all properties are accumulated in one operation.

How to repeat:
N/A

Suggested fix:
Do the suggested refactoring.

Posted by developer:
 
Fixed in 8.0.2.

Code cleanup. No changelog entry needed.