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Type: Task
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 8.2.0-rc0
Affects Version/s: None
Component/s: None
Labels:
- M1

Assigned Teams:

Query Execution
Sprint:
QE 2025-05-26, QE 2025-06-09, QE 2025-06-23, QE 2025-07-07
Confidence Status:
None
Work Order:
3
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

The explain command relies on the DocumentSource::serializeToArray() virtual method, which will remain in the DocumentSource class hierarchy. However, starting from a certain verbosity level of the explain command, it also requires common and specific execution statistics, which will be moved to the agg::Stage class hierarchy.

The output of the explain command should stay unchanged during and by the end of this project. An instance of Pipeline class will co-exist with the corresponding instance of agg::Pipeline for producing the expected explain command output.

Although at this point both Pipeline and agg::Pipeline share all the sources=stages, the goal of this ticket is to collect the execution statistics from the agg::Pipeline and merge, as if the stages were not shared.

Relevant prototype commit for the reference (might not fully match the current design): https://github.com/10gen/mongo/pull/34036/commits/89b3adeda666e2da88cf61f01828d38c5ff099b4

We need to be mindful about possible performance regressions and explain output changes on this one.

depends on

SERVER-103957 Move Pipeline::getNext() and Pipeline::getNextDocument() methods to agg::Pipeline()

Closed

is depended on by

SERVER-104234 Split DocumentSourceInternalSetWindowFields into QO and QE components

Backlog

SERVER-104225 Split DocumentSourceCursor into QO and QE components

In Code Review

SERVER-104230 Split DocumentSourceSort into QO and QE components

In Code Review

SERVER-104231 Split DocumentSourceLookUp into QO and QE components

In Code Review

SERVER-104232 Split DocumentSourceUnwind into QO and QE components

In Code Review

SERVER-104240 Split DocumentSourceUnionWith into QO and QE components

In Code Review

SERVER-104242 Split DocumentSourceGraphLookUp stage into QO and QE components

In Progress

SERVER-105370 Split DocumentSourceFacet stage into QO and QE components

In Progress

SERVER-104227 Split DocumentSourceMatch into QO and QE components

Closed

SERVER-104228 Split DocumentSourceSingleDocumentTransformation into QO and QE components

Closed

SERVER-104229 Split DocumentSourceGroup and DocumentSourceStreamingGroup into QO and QE components

Closed

SERVER-104238 Split DocumentSourceInternalDensify into QO and QE components

Needs Scheduling

SERVER-105521 Check where we can delete DocumentSource pipeline once exec::agg::Pipeline is created

Needs Scheduling

is related to

SERVER-104224 Inherit individual DocumentSource subclasses from agg::Stage

Closed

related to

SERVER-105371 Move remaining QE-relevant functions from Pipeline to agg::Pipeline

Closed

(9 is depended on by, 1 is related to, 1 related to)

Assignee:: Serhii Lysenko
Reporter:: Romans Kasperovics
Participants:: Githook User, Romans Kasperovics, Serhii Lysenko
Votes:: 0 Vote for this issue
Watchers:: 2 Start watching this issue

Created:: Apr 23 2025 02:47:30 PM UTC
Updated:: Jun 26 2025 06:51:20 AM UTC
Resolved:: Jun 26 2025 06:41:43 AM UTC
Confidence Status Last Update:: 22/May/25 8:54 AM

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