Static review at d1294dc070638282ffebb93260133f713d958482 found four blocking issues.

Checkpoint summary:

• Goal and scope: the simple default-mode and lowercase-name cases work, but supported SQL modes and legal native/external field names remain incorrect. SHOW, CREATE TABLE LIKE, synced DDL, nested ARRAY/MAP recursion, and information_schema descriptor paths were traced.
• Concurrency, lifecycle, configuration, persistence, and writes: no new lock, shared-state, configuration, row-write, or transaction issue was found. Interactive renderers must use the live SQL mode without making follower-side CCR generation thread-context-dependent.
• Compatibility: the current patch does not change Thrift or persisted schema and therefore introduces no wire decode break. Rolling BEs can temporarily return old anonymous versus new named STRUCT text; carrying exact display names later should use an optional field with fallback.
• Tests and results: the changed expected values are statically consistent for identifier-safe/default-mode cases, but coverage misses the two production counterexamples. The external results were derived rather than runner-generated, and the fixed DDL strings are absent from generated output.
• Observability, performance, and security: no additional concern was found; the rendering work remains linear on metadata paths.

No builds or tests were run because the controlling review prompt prohibits execution in this runner. Author and CI claims were treated as non-independent evidence; the visible checks are style-oriented while functional jobs were skipped. User focus: no additional focus was supplied.

Static review at 28ace2f71e255511aae981e78dd4df57d2349fbf found no new PR-introduced issue, but the previously raised field-identifier blocker remains unresolved, so I am retaining request changes without duplicating its inline comment.

Checkpoint summary:

• Goal, correctness, and scope: the patch is focused, preserves nested comments in managed SHOW/CREATE LIKE DDL under the active SQL mode, and adds STRUCT field names to COLUMN_TYPE. However, exact head still sends normalized StructField.getName() rather than the original/display spelling and leaves hyphen, whitespace, and reserved-word field names bare, producing lossy or unparsable type text. This is already covered by the existing inline thread, so no duplicate inline comment was added.
• Concurrency, lifecycle, and configuration: no new shared state, threads, lock-order edge, lifecycle object, or configuration item was found. The session mode is read once per table, sync rendering short-circuits to the canonical default mode, and CREATE TABLE LIKE parses after releasing the source-table read lock.
• Compatibility, persistence, and writes: the Thrift shape and persisted catalog/journal formats are unchanged. Mixed-version BEs can temporarily return old anonymous versus new named STRUCT display text, but no request/decode break, transaction change, or data-write path was introduced.
• Parallel paths and conditions: both managed Env emitters pass the mode consistently; ARRAY/MAP recursion, empty STRUCTs, generated-column restoration, and the sync path were traced. No additional PR-introduced replay or error-handling defect was substantiated.
• Tests and results: the added JUnit/BE/regression coverage checks nested comments, default and NO_BACKSLASH_ESCAPES rendering, generated SHOW output, recursion, and deterministic metadata ordering. It still does not close the existing mixed-case/general-identifier gap noted above. This was a static-only review: no builds or tests were run because the controlling prompt prohibits them, and author/CI claims were not treated as independent functional validation.
• Observability and performance: no new logging/metric need was found; the added work is bounded linear metadata formatting with one mode lookup per table.

User focus: no additional focus was supplied.

Static review of 28ace2f71e255511aae981e78dd4df57d2349fbf: request changes. I found one new P2 in the CCR parse-mode contract and left it inline. The field-name/original-spelling defect is still present on this head, but it is already covered by discussion_r4059151457, so I did not duplicate it.

Critical checkpoint conclusions:

• Goal and proof: Nested comments now round-trip for interactive SHOW/LIKE in the matching session mode, and normalized struct names are added to COLUMN_TYPE; the end-to-end goal is not complete because CCR can still change backslashes when the target parser mode differs.
• Scope/focus: The patch is otherwise small and focused. There was no additional user-provided focus; the full ten-file diff was reviewed.
• Concurrency: No new mutable shared state or lock ordering is introduced. Table metadata is rendered under the existing read lock; the sampled session mode is read-only.
• Lifecycle/static initialization: No new background lifecycle, ownership cycle, cleanup path, or cross-TU/static-initialization dependency is introduced.
• Configuration: No new configuration item is added, but the existing dynamic/global sql_mode is precisely the unresolved cross-cluster input called out inline.
• Compatibility: The Thrift/storage shapes are unchanged and old/new FE-BE combinations remain decodable. The removed internal three-boolean overload has no supported separately versioned consumer found.
• Parallel paths: SHOW, LIKE, sync serialization, both Env renderers, recursive ARRAY/MAP/STRUCT formatting, FE-to-BE metadata production, and the external CCR consumer were traced. The two Env sites share the same accepted defect.
• Conditions/errors: Managed/external, sync/interactive, generated-placeholder, nested-comment-present, and old-descriptor branches were checked. Error propagation is unchanged; no new swallowed status or speculative fallback was found.
• Tests and expected results: The BE/JUnit/regression cases and all modified golden sections were checked statically for registration, ownership, ordering, and expected shapes. They do not cover the differing CCR target mode. Existing output-provenance threads were not duplicated.
• Observability: This is deterministic metadata rendering; no new metric or logging requirement was identified.
• Persistence/transactions/data writes: No EditLog, storage, or transaction format changes are introduced. The only persisted boundary affected is the binlog-carried SQL text, whose consumer contract is the new P2.
• FE-BE variables: No new FE-BE field is added; the existing child descriptor remains wire-compatible. Its original-name loss is the already-open identifier thread.
• Performance/memory: Work remains bounded metadata-only string construction; no material hot-path, allocation-accounting, or lifetime regression was found.
• Other: The PR changes user-visible SHOW and information_schema output, so the Release note: None / unchecked behavior-change metadata should also be corrected before merge.

Validation was static-only: the review task prohibits builds and tests, so author/CI execution claims were not independently rerun. Two complete review rounds converged, every candidate was adjudicated or duplicate-fenced, and no unresolved review candidate remains beyond the submitted issue and existing threads.

Reviewed all four changed paths at 4a7cf3bb356e6612c6f3bd742fc23af7242cd66d using the supplied aggregate diff and static analysis. One new P2 finding: the new full SHOW CREATE expectation fails in the supported Cloud p0 pipeline before the replay/LIKE checks.

Critical checkpoint conclusions:

• Goal and proof: enabling the existing recursive renderer preserves nested comments in managed-table SHOW CREATE and CREATE TABLE LIKE under ordinary SQL mode. Three added JUnit tests cover formatting/escaping and the DESCRIBE flag; the regression includes nested STRUCT, ARRAY, replay and LIKE. Runtime success was not verified by this review.
• Scope and reuse: the production change is one rendering flag and reuses existing type traversal; the remaining changes are tests/results.
• Concurrency and locking: no new shared mutation, threads or lock acquisition. SHOW/LIKE use existing table read locks; the added work is local formatting without RPC, IO or journal waits.
• Lifecycle and initialization: no new resources, ownership, globals or initialization-order dependency.
• Configuration: no new settings. The existing interactive SQL-mode issue in thread 4059151453 still applies: the new call defaults to backslash escaping while LIKE parses with the session mode. It was independently confirmed and not reposted.
• Compatibility: no function-signature, persisted schema or wire-format changes; existing nonempty stored comments are read by the current renderer. No new rolling-upgrade requirement identified.
• Thrift/protobuf: untouched; no field-id or enum changes.
• Parallel paths: SHOW and LIKE both reach the changed compatible renderer; ARRAY/MAP/STRUCT recursion forwards the comment flag. External non-compatible rendering and type-only DESCRIBE retain their existing behavior. The known CCR SQL-mode concern is covered by thread 4079713811 and was not reposted.
• Conditional logic and errors: no new branch or error handling; omitted/null comments and explicit empty comments follow the existing presence flag and literal formatter.
• Test coverage: the additions cover ordinary-mode literals and recursive STRUCT/ARRAY output. They do not add MAP, empty-comment, SQL-mode-switch or persisted-reload round trips. Static tracing found no additional local issue in those shapes; the mode-switch defect is already reported.
• Expected results: unit expectations and CSV escaping agree with ordinary-mode non-Cloud defaults. The inline finding documents the concrete Cloud mismatch. The earlier generated-output concern in thread 4059151464 has been addressed by adding output, but that new full-row expectation introduces this separate failure. This review cannot attest how the author generated results.
• Observability: this metadata-formatting change needs no additional logs or metrics.
• Persistence and failover: no EditLog, replay or transaction processing change; existing comment metadata is reused.
• Data writes and crash safety: no data-write or atomicity change, and no new leak/deadlock boundary; LIKE uses the existing CREATE execution path.
• FE/BE propagation: no new transmitted variables.
• Performance: necessary escaping is linear in comment length on metadata paths; no new catalog scans or query-execution work.
• Other issues and focus: there was no additional user focus. All candidates and initial risks have accepted, duplicate or evidence-backed dismissed dispositions; no unresolved static-review scope remains. Existing supplied findings are P2, so there are no existing P0/P1 IDs to carry forward.

Validation limits: no builds, tests or runtime/CCR execution were performed, as required by the review contract. Author-reported test success is not treated as executed validation. The downstream CCR compatibility rewriter has a pre-existing limitation with comment-like text inside literals; it is outside this producer change and is not a new inline finding.

Review converged after 2 round(s).

Reviewed all four changed files at b88a6a8. No new inline findings after duplicate filtering. Static tracing supports nested-comment preservation in ordinary-mode SHOW CREATE TABLE, replay, and CREATE TABLE LIKE.

The existing P2 SQL-mode finding still applies: Column selects the overload that doubles backslashes, while LIKE reparses using the live NO_BACKSLASH_ESCAPES mode. It was independently confirmed and not reposted. The Cloud output concern and fixed-result capture concern are addressed by the column-only converter and three golden blocks. The CCR consumer-mode thread remains prior context; its current external implementation was not revalidated. There are no existing P0/P1 findings to carry forward.

Critical checkpoint conclusions:

• Goal and proof: the compatible renderer now includes stored nested comments; three unit methods and SHOW/replay/LIKE regression expectations cover the main ordinary-mode behavior. The known SQL-mode limitation above remains.
• Scope and reuse: one production-line change reuses the established recursive renderer and literal quoting utility; supporting tests are focused.
• Concurrency and locks: SHOW/LIKE read source metadata under existing table read locks; no shared mutation, lock-order change, external IO, or journal wait is added.
• Lifecycle: temporary Java strings/builders introduce no new resource ownership, threads, caches, cycles, or static initialization.
• Configuration: no configuration item is added or changed.
• Compatibility: generated SQL gains existing COMMENT syntax; symbols, storage formats, and rolling-upgrade protocols are unchanged. SQL-mode compatibility is covered by the known thread.
• Thrift/protobuf: no definitions, ids, enum values, or required fields change.
• Parallel paths: SHOW and LIKE share the changed method; STRUCT/ARRAY/MAP recursion forwards comment inclusion. DESCRIBE keeps its explicit inclusion policy; existing external rendering is unaffected.
• Conditions and errors: absent-comment gating is intentional; no new speculative fallback, swallowed error, or unchecked Status is introduced.
• Test coverage: unit cases cover missing/present comments, quotes, backslashes and explicit display policy; regression checks nested STRUCT and ARRAY plus replay/LIKE. MAP, mode variants, empty comments and quoted identifiers lack new end-to-end cases; relevant mode/identifier concerns overlap existing context.
• Changed expectations: all three golden rows, tags, indentation, SQL escaping and framework CSV escaping are statically consistent. The converter runs before both generation and comparison and excludes native/Cloud table properties.
• Observability: existing tagged expected/actual test diagnostics are sufficient for this metadata-formatting change; no new metrics or logs are needed.
• Transactions and persistence: comments already reside in schema metadata; no EditLog, replay, failover, visible-version or delete-bitmap implementation changes.
• Data writes and crash behavior: no row-write or atomicity path changes; LIKE uses the existing CREATE implementation after parsing.
• FE/BE variables: no new cross-process state or sending path.
• Performance and memory: extra work is linear in emitted comment bytes and uses request-local Java objects; no new hot-path amplification or retained ownership was found.
• Other concerns and user focus: no additional focus was supplied. A final edge-case sweep found no distinct introduced issue beyond the existing threads.

Validation limits: static review only; no builds or tests were run. HEAD reports output generation through run-regression-test.sh, but runtime success and generation provenance were not independently verified here. All source scope and risk candidates have explicit dispositions; no unresolved source candidate remains. All three assigned reviewers returned NO_NEW_VALUABLE_FINDINGS in round 1.

Review converged after 1 round(s).