Use estimatedDocumentCount to Get Rough Document Count

[xingfan-git]

No description provided.

[Copilot]

Pull Request Overview

This PR improves performance when counting documents in MongoDB collections by switching from countDocuments() to estimatedDocumentCount(). The change trades accuracy for significant performance gains, especially beneficial for large collections.

Key changes:

• Replaces exact document counting with metadata-based estimation for O(1) complexity
• Removes filtering support from the count operation (documented as future work)
• Updates method signatures to reflect the simplified interface

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/services/tasks/copy-and-paste/documentdb/documentDbDocumentReader.ts	Removes filter parameter and switches to estimated counting with performance justification comments
src/documentdb/ClustersClient.ts	Adds new estimateDocumentCount() method that wraps MongoDB's estimatedDocumentCount()

[tnaum-ms]

🚀 Perfect, thank you!

Please review what happens with our task progress reporting in case an unexpected value comes back from the estimatedDocumentCount, like a 0.

I'm not sure if we have safeguards in place where we compute the progress.