feat(clp-s): Add hook to Projection class to help project columns in a specific order

[gibber9809]

Description

This PR adds the get_ordered_matching_nodes function to the Projection class to allow users of the class to see how the resolved nodes correspond to their original projection in order. This function has the same semantics as get_matching_nodes_list from the OrderedProjection class in the Velox integration. Once this PR is merged the Velox integration PR should be able to replace all usage of OrderedProjection with the regular Projection class.

Adding support for tracking order in this way seems to have added no measurable overhead, which is to be expected since the overhead should be O(N) in number of columns being projected, and this overhead is incurred one time when resolving columns.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• Manually validated that projection still functions as expected
• Manually validated that there is no measurable overhead for tracking order

Summary by CodeRabbit

• New Features
  • Enhanced the matching mechanism to improve accuracy and consistency of search results.
  • Introduced a new feature that enables retrieval of ordered matching results for improved result clarity.

[coderabbitai]

Walkthrough

This pull request adds functionality to the Projection class for improved tracking of matching nodes during column processing. The resolve_column method in the implementation file now aggregates matching node IDs into a temporary vector, which is subsequently moved into a newly added member variable m_ordered_matching_nodes. In tandem, the header file introduces the public getter get_ordered_matching_nodes to expose the stored matching nodes. No changes are made to existing public entity declarations.

Changes

File(s) Changed	Summary of Changes
components/.../Projection.cpp, components/.../Projection.hpp	Updated resolve_column to collect matching node IDs into a temporary vector and append them to m_ordered_matching_nodes; added public method get_ordered_matching_nodes and corresponding member variable in the header.

Sequence Diagram(s)

sequenceDiagram
    participant Caller as Caller
    participant P as Projection
    Caller->>P: Call resolve_column(descriptors)
    P->>P: Initialize matching_nodes_for_column
    loop Process descriptors
        alt Descriptor matches and is last token
            P->>P: Append child node ID to matching_nodes_for_column
        end
    end
    P->>P: Append matching_nodes_for_column to m_ordered_matching_nodes
    P->>Caller: Return result

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Possibly related PRs

• clp-s: Add support for projecting of a subset of columns during search. #510: Enhances column projection handling in the Projection class, which is directly related to the new matching nodes tracking feature introduced in this PR.

Suggested reviewers

• wraymo

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Reviewing files that changed from the base of the PR and between c625a66 and 213904d.

📒 Files selected for processing (2)

• components/core/src/clp_s/search/Projection.cpp (3 hunks)
• components/core/src/clp_s/search/Projection.hpp (2 hunks)

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• components/core/src/clp_s/search/Projection.cpp
• components/core/src/clp_s/search/Projection.hpp

🧬 Code Definitions (1)

components/core/src/clp_s/search/Projection.cpp (1)

components/core/src/clp_s/search/Projection.hpp (1)

• m_ordered_matching_nodes (72-74)

⏰ Context from checks skipped due to timeout of 90000ms (5)

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🔇 Additional comments (6)

components/core/src/clp_s/search/Projection.cpp (4)

57-57: Appropriate handling for no matches case.

The code correctly handles the case where no matching node is found for the column's namespace by adding an empty vector to m_ordered_matching_nodes. This ensures that the number of elements in m_ordered_matching_nodes always corresponds to the number of columns added, maintaining a consistent mapping.

---

60-60: Good initialization of tracking vector.

Creating a temporary vector to collect matching nodes for the current column before moving it into the member variable is a clean approach. This avoids potential issues with directly modifying the member variable during iteration.

---

82-82: Correctly tracking matching node IDs.

This addition properly tracks child node IDs for the current column when a match is found and it's the last token. This is consistent with the existing behavior of adding to m_matching_nodes but now preserves the order information as well.

---

93-93: Efficient use of move semantics.

Using std::move to transfer the contents of the temporary vector into the member variable is efficient and prevents unnecessary copying of the data. This is particularly important when processing large datasets with many matching nodes.

components/core/src/clp_s/search/Projection.hpp (2)

68-74: Well-documented public getter method.

The documentation clearly explains the purpose of the method and the order guarantee provided. The implementation returns a const reference which is appropriate for this use case as it prevents modification of the internal data structure while avoiding unnecessary copies.

---

86-86: Appropriate member variable for tracking ordered nodes.

The addition of this member variable to store the ordered matching nodes is well-placed among other related member variables. The variable name is clear and follows the naming convention used in the class.

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[wraymo]

This looks good to me