tests(select_exclude) + sql(select_exclude): implement SELECT ... EXCLUDE(...) and normalize mysql-test files

[hlosukwakha]

Summary

Implements the SQL extension SELECT ... EXCLUDE(...) end-to-end and normalizes the mysql-test files required to validate the feature.

• Adds EXCLUDE grammar and parser support.
• Attaches exclude-list metadata to the AST Item_asterisk.
• Propagates exclude-lists through the resolver into wildcard expansion.
• Normalizes/cleans MTR test files so the local harness passes (removes code fences, fixes spacing/newlines, aligns .result output with harness logs).
• This MR contains both the source changes and the corresponding test-suite updates necessary to validate the feature locally.

---

What changed (high level)

Source

• Parser
  • sql_yacc.yy — new EXCLUDE production to parse EXCLUDE (ident_list) and build parser-allocated lists.
• AST / Items
  • item.h — Item_asterisk extended to hold an exclude-list pointer.
• Wildcard expansion / helpers
  • sql_base.h / sql_base.cc — insert_fields updated to accept and apply exclude lists when expanding *.
• Resolver
  • sql_resolver.cc — Query_block::setup_wild reads Item_asterisk::m_exclude_list and forwards it to the expansion routine.
• Minor supporting changes to show/processlist files (to avoid accidental regression while adding the feature).

Tests

• select_exclude_multi_table.test and .result — multi-table tests for EXCLUDE(...) (cleaned of formatting artifacts and normalized).
• select_exclude_edgecases.test and .result — edge-case tests (duplicates, excluding all columns, nested selects); cleaned and normalized.
• (See full file list below.)

---

Files changed (representative)

• sql_yacc.yy
• item.h
• sql_base.h
• sql_base.cc
• sql_resolver.cc
• show_query_builder.cc
• sql_show_processlist.cc
• sql_show_status.cc
• select_exclude_multi_table.test
• select_exclude_multi_table.result
• select_exclude_edgecases.test
• select_exclude_edgecases.result

---

Commits

• f1d5595f92b — tests(select_exclude): normalize test and .result files for select_exclude feature
• e7d7709dc4c — sql(select_exclude): implement EXCLUDE syntax (parser, Item_asterisk, wildcard expansion)

---

Why this change

The EXCLUDE(...) syntax provides a convenient way to select all columns except a small list of columns (PII, secret fields, etc.) without enumerating the full column list.

• Adds end-to-end support (parse → AST → resolve → expand) and tests to validate behavior.

---

Backwards compatibility / risk

• This introduces a new SQL grammar construct. It is additive and does not change existing syntax.
• Minimal risk to existing features if the exclude list is simply ignored for contexts that don't use it.
• Tests were normalized, and I used the exact harness output to ensure MTR compatibility — please double-check CI environments for any locale/ICU differences.

---

How to test locally (quick)

From the repository root:

1. Build/run your usual out-of-source CMake build as you normally would (if you need to run a full server).
2. Run just the affected MTR tests (fast local check).

Expected: the three tests pass locally (they passed for me after normalizing the tests). Inspect logs if needed:

• mysql-test/var/log/local.select_exclude_multi_table/
• mysql-test/var/log/local.select_exclude_edgecases/

---

CI considerations

The test normalization was done to match the local harness. CI may run in a slightly different environment (ICU/data directories, locale, or tab/space rendering). If CI shows mismatches:

• Confirm the CI runtime and mysql-test environment (ICU data paths or locale).
• If message wording differs on CI, update .result to the canonical CI output or make the test less strict where appropriate.
• Consider adding the new local tests to the CI collection that runs for feature branches.

---

Notes / implementation details

• Parser: new opt_exclude production returns a List<String> * allocated by the parser; this is attached to Item_asterisk.
• AST: Item_asterisk stores m_exclude_list and forwards it during resolve.
• insert_fields(...) now accepts an exclude-list pointer and filters column names before appending them to the select list.
• Resolver: Query_block::setup_wild detects Item_asterisk and forwards the exclude list to insert_fields.

---

Review checklist

• Parser changes: scanning and bison-generated output reviewed for correctness.
• Item_asterisk changes: ensure memory ownership expectations are respected when parser-allocated lists are attached to AST nodes.
• insert_fields changes: test with qualified/unqualified stars, duplicate names, and multi-table joins.
• Run impacted unit tests and MTR suite subset.
• Confirm there are no unexpected changes to mysqld error or logging wording.

---

Suggested reviewers

• SQL parser / grammar maintainers
• SQL resolver / query-expansion owners
• MTR/test-maintainers for the mysql-test changes

---

Additional follow-ups (optional)

Expand MTR coverage to cover:

• Qualified vs unqualified stars in complex join/CTE scenarios.
• Interaction with SELECT ... INTO and INSERT ... SELECT.
• Behavior when exclusion lists include columns from multiple source tables with the same name.

Other:

• Add inline comments to new parser/AST fields to describe memory ownership and lifetime expectations.
• Consider adding integration tests that run under CI's environment to avoid environment-specific .result mismatches (locale/ICU).

---

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
Please make sure to include your MySQL bug system user (email) in the returned form.
Thanks