[SERVER-59892] Convert ExpressionWithPlaceholder into a MatchExpression Created: 11/Sep/21  Updated: 06/Dec/22

Status: Backlog
Project: Core Server
Component/s: Querying
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: Timour Katchaounov Assignee: Backlog - Query Optimization
Resolution: Unresolved Votes: 0
Labels: quick-tech-debt
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
depends on SERVER-54740 Extend flexibility to the MatchExpres... Backlog
Assigned Teams:
Query Optimization
Participants:

 Description   

Class ExpressionWithPlaceholder is a pair of a MatchExpression, and a string. This is very unfortunate as it prevents this class from being processed as part of a MatchExpression tree.

Specifically this makes it very hard to implement common storage for the children of all MatchExpression classes, which in turn prevents the implementation of SERVER-54740.

This task should implement ExpressionWithPlaceholder as a subclass of MatchExpression with a single class member - boost::optional<std::string> _placeholder;


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