fix: WEEK() function mode parameter support (Fixes #24236)

[LeftHandCold]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

fixes #24236

What this PR does / why we need it:

Re-implements WEEK() mode parameter support from main on 3.0-dev while preserving existing one-argument WEEK behavior.

MySQL's WEEK(date, mode) accepts an integer 0-7 as second argument to control week numbering semantics. Previously, MatrixOne's WEEK only registered single-argument overloads, causing WEEK(date, 3) to fail with "invalid argument function week, bad value [DATE BIGINT]".

This PR:

• Preserves the legacy one-argument WEEK(date) / WEEK(datetime) result path used by existing BVT cases
• Applies MySQL mode semantics only when the second mode argument is provided
• Registers (T_date, T_int64) and (T_datetime, T_int64) overloads
• Handles non-constant mode values and row-level NULL mode values correctly
• Adds coverage for the 2000-01-01 default WEEK case that failed BVT

Validation

• go test ./pkg/sql/plan/function -count=1

[Copilot]

Pull request overview

This PR broadens MySQL-compatibility in the SQL layer by adding WEEK(date, mode) overloads and also introducing several additional MySQL behaviors (null-safe <=>, JSON ->/->> operators, JSON→numeric casts, and multi-table DROP TABLE) spanning parser, planner, compiler, and frontend privilege handling.

Changes:

• Add WEEK(date|datetime, int64 mode) overloads and update week computation to accept a mode argument.
• Implement MySQL operators/features: null-safe equal <=>, JSON -> / ->> parsing, and JSON→numeric casting behavior.
• Add support for multi-table DROP TABLE through plan/proto, planning, compilation, and privilege extraction/auth checks, plus distributed test coverage.

Reviewed changes

Copilot reviewed 32 out of 34 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/distributed/cases/join/apply.result	Updates expected results now that JSON can be compared/cast to numeric.
test/distributed/cases/function/func_null_safe_equal.sql	Adds distributed SQL coverage for <=> semantics.
test/distributed/cases/function/func_null_safe_equal.result	Expected outputs for <=> distributed tests.
test/distributed/cases/function/func_json_arrow.sql	Adds distributed SQL coverage for JSON -> / ->> operators.
test/distributed/cases/function/func_json_arrow.result	Expected outputs for JSON arrow operator tests.
test/distributed/cases/ddl/drop_table_multiple.sql	Adds distributed coverage for multi-table DROP TABLE behavior.
test/distributed/cases/ddl/drop_table_multiple.result	Expected outputs for multi-table DROP TABLE tests.
proto/plan.proto	Extends DropTable plan message with per-table entries for multi-drop.
pkg/sql/plan/function/list_operator.go	Registers <=> operator and its type-checking/cast behavior.
pkg/sql/plan/function/list_builtIn.go	Registers 2-arg WEEK() overloads for `(date
pkg/sql/plan/function/init.go	Adds encoded ID/name constants for <=>.
pkg/sql/plan/function/function_id_test.go	Updates function-id registry expectations for new <=> id.
pkg/sql/plan/function/function_id.go	Adds NULL_SAFE_EQUAL function id and registers <=> name.
pkg/sql/plan/function/func_unary.go	Reworks DateToWeek / DatetimeToWeek to accept an optional mode.
pkg/sql/plan/function/func_compare_test.go	Adds unit tests for numeric comparisons and <=> edge cases.
pkg/sql/plan/function/func_compare_fix.go	Rewrites numeric type-mismatch comparison fallback (exact/approx paths).
pkg/sql/plan/function/func_compare.go	Implements <=> execution and updates mismatch-compare callsites.
pkg/sql/plan/function/func_cast_test.go	Adds unit tests for JSON→numeric casting semantics (precision/overflow/null).
pkg/sql/plan/function/func_cast.go	Enables JSON→numeric casts and implements conversion logic.
pkg/sql/plan/deepcopy.go	Adds deep-copy support for recursive multi-drop DropTable plans.
pkg/sql/plan/build_expr_test.go	Adds plan-binding tests for tuple <=> behavior.
pkg/sql/plan/build_ddl_test.go	Adds tests for FK-related drop-target logic in multi-drop.
pkg/sql/plan/build_ddl.go	Implements multi-table DROP TABLE planning and FK-target checking.
pkg/sql/plan/build_alter_table_test.go	Adds tests asserting JSON→numeric remains blocked for DDL type changes.
pkg/sql/plan/build_alter_modify_column.go	Blocks JSON→numeric type changes in DDL while allowing runtime casts.
pkg/sql/plan/base_binder.go	Adds binder support for <=> including tuple expansion to AND of <=>.
pkg/sql/parsers/dialect/mysql/scanner.go	Adds tokenization for ->> (LONG_ARROW).
pkg/sql/parsers/dialect/mysql/mysql_sql_test.go	Adds SQL pretty-print tests for -> / ->> rewrites.
pkg/sql/parsers/dialect/mysql/mysql_sql.y	Adds grammar rules translating ->/->> into json_extract / json_unquote(json_extract).
pkg/sql/compile/ddl.go	Executes multi-drop by iterating per-table entries and adds warning-on-missing-child-table path.
pkg/frontend/authenticate_test.go	Adds privilege/ownership tests for multi-table DROP TABLE and plan tip extraction.
pkg/frontend/authenticate.go	Updates privilege tip extraction and privilege/ownership checks for multi-drop.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-05-06 10:11 UTC · Rule: release-3.0
• ✅ Checks passed · in-place
• ✅ Merged — 2026-05-06 11:53 UTC · at 03c8946cf275c2170982021d0e1c5a8ac708de5e · squash

This pull request spent 1 hour 41 minutes 42 seconds in the queue, including 53 minutes 1 second running CI.

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  • fix: WEEK() function mode parameter support (Fixes #24236) #24239
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  • fix: WEEK() function mode parameter support (Fixes #24236) #24239
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