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Two ways a STRUCT loses information on its way back to the user. SHOW CREATE TABLE dropped the COMMENT of every nested field. Column.toSql called Type.hideVersionForVersionColumn(true), whose showNestedComment parameter defaults to false, so the struct branch skipped the comment. DESCRIBE passes the flag explicitly, so only the DDL emitters lost it. That is not only a display defect. CreateTableLikeCommand re-parses the generated statement, so CREATE TABLE LIKE built a table whose nested comments were gone for good, and binlog/CreateTableRecord ships the same text to CCR, leaving the downstream schema different from the source. Backup and restore are unaffected, they serialize the Table object. information_schema.COLUMNS.COLUMN_TYPE printed struct<int(11),string>: the STRUCT branch of SchemaColumnsScanner::_type_to_string recursed into the children but never printed their names, so no client could rebuild the schema from that text. It now prints name:type per field. The loop also moves off the "size() - 1" form that only avoided a size_t underflow because of the surrounding empty check. Four golden files record a struct COLUMN_TYPE and are updated. The two under external_table_p0/iceberg were derived from the suites' own schema evolution sequences and cross-checked against the types and the element_at() row queries already in those files; they need a real Iceberg and Spark environment to regenerate. Fixes DORIS-28314, DORIS-28967. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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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.
| sb.append(type.hideVersionForVersionColumn(true)); | ||
| // isToSql = true, showNestedComment = true | ||
| // SHOW CREATE TABLE and CREATE TABLE LIKE need the nested comment. | ||
| sb.append(type.hideVersionForVersionColumn(true, true, false)); |
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[P2] Honor NO_BACKSLASH_ESCAPES when rendering comments
Passing false always doubles backslashes. With NO_BACKSLASH_ESCAPES, a stored nested comment containing one backslash is emitted with two; CreateTableLikeCommand then reparses that DDL with the session-aware lexer and stores both literally, so the copied table—and a client replaying SHOW text under that mode—no longer preserves the comment. Please thread the live mode into interactive SHOW/LIKE rendering (while keeping synced CCR output on an explicit canonical mode) and cover this mode in the round-trip test.
| ret += ","; | ||
| } | ||
| ret += _type_to_string(desc.children[desc.children.size() - 1]); | ||
| ret += desc.children[i].columnName + ":" + _type_to_string(desc.children[i]); |
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[P2] Preserve and quote struct field identifiers
columnName is the normalized lookup name, and concatenating it raw cannot represent every legal field. For example, Iceberg Metric is reported as metric, while a native field named a-b (declared with backticks) is emitted as struct<a-b:int(11)>, which cannot be parsed back as one field. Please carry the original/display spelling to this boundary, escape it as an SQL identifier, and add mixed-case plus quoted-name coverage.
| s struct<string,bigint(20),string,string,string> | ||
| arr array<struct<bigint(20),int(11),int(11)>> | ||
| m map<string,struct<bigint(20),int(11),int(11)>> | ||
| s struct<first_pos:string,a:bigint(20),after_a:string,b:string,c2:string> |
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[P2] Regenerate the external expected results
The commit message says the two Iceberg/Spark .out updates were derived from the suite logic because the required environment was unavailable. Repository test rules require regression results to be generated by the owning test scripts, and static tracing cannot prove the refreshed external systems return these exact bytes. Please run both suites in the prescribed environment and commit their generated outputs.
| logger.info("SHOW CREATE TABLE struct_nested_comment: ${createStmt}") | ||
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| // Substring checks, the full statement carries volatile properties that no .out can pin. | ||
| assertTrue(createStmt.contains("struct<a:int,b:text comment \"owner''s \\\\path\",c:int>")) |
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[P2] Capture the fixed DDL expectations in generated output
These three fragments are deterministic user-visible results, but the new .out contains only the COLUMN_TYPE query. The regression rules require fixed expected results to go through the generated-output workflow instead of Groovy assertions. Please normalize/capture the stable SHOW/LIKE comment text in the suite's generated result; the runtime-derived replay/LIKE equality checks can remain dynamic assertions.
Follow-up on review. The comment was escaped for the default SQL mode whatever the session was using. Under NO_BACKSLASH_ESCAPES a back slash was doubled on the way out and read back as two, so every CREATE TABLE LIKE doubled it again. Read the mode once per statement, outside the column loop: a synced statement is built on the journal replay thread, which has no session, and reading the mode per column would clone the whole SessionVariable each time. Synced DDL is pinned to the default mode so the master and a replaying follower ship the same text for one table. COLUMN_TYPE concatenated the field name next to the separators that give the text its shape, so a legal name holding one of them, declared with back quotes, made the text impossible to split back into fields. Such a name is now back quoted. A name with a hyphen, a space or a keyword carries no meaning in this text and stays bare. The two Iceberg golden files are the ones the suites generate, run against a local iceberg docker stack; they match the values the earlier commit derived from the suite logic. The fixed SHOW CREATE TABLE text now goes through the generated output instead of Groovy assertions. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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/review |
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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 normalizedStructField.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_ESCAPESrendering, 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.
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