Add support for unquoted NEW and OLD keywords in RETURNING clauses

[arnaud-lacurie]

WIP

[github-actions]

📊 Metrics Diff Analysis Report

Summary

• New queries: 6
• Dropped queries: 6
• Plan changed + metrics changed: 0
• Plan unchanged + metrics changed: 0

ℹ️ About this analysis

This automated analysis compares query planner metrics between the base branch and this PR. It categorizes changes into:

• New queries: Queries added in this PR
• Dropped queries: Queries removed in this PR. These should be reviewed to ensure we are not losing coverage.
• Plan changed + metrics changed: The query plan has changed along with planner metrics.
• Metrics only changed: Same plan but different metrics

The last category in particular may indicate planner regressions that should be investigated.

New Queries

Count of new queries by file:

• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml: 6

Dropped Queries

The following queries with metrics were removed:

• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:2: EXPLAIN update A set A2 = 42, A3 = 44 where A1 <= 2 returning "new".A3 OPTIONS(DRY RUN);
• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:14: EXPLAIN update A set A2 = 42, A3 = 44 where A1 <= 2 returning "new".A3;
• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:25: EXPLAIN update A set A2 = 42, A3 = 44 where A1 <= 2 returning "new".A3 + "new".A3 OPTIONS(DRY RUN);
• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:37: EXPLAIN update A set A2 = 42, A3 = 44 where A1 <= 2 returning "new".A3 + "new".A3;
• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:49: EXPLAIN update A set A2 = 52 where A1 > 2 OPTIONS(DRY RUN);
• yaml-tests/src/test/resources/update-delete-returning.metrics.yaml:60: EXPLAIN update A set A2 = 52 where A1 > 2;

The reviewer should double check that these queries were removed intentionally to avoid a loss of coverage.