Allow to use the optional IN PARTITION expression in ALTER TABLE

[git-hulk]

This closes #204.

[Copilot]

Pull Request Overview

This PR adds support for the optional IN PARTITION expression in ALTER TABLE UPDATE statements, allowing users to specify which partition to update. The change implements the full syntax: ALTER TABLE UPDATE column = expr [IN PARTITION partition_id] WHERE condition.

Key changes:

• Added InPartition field to AlterTableUpdate AST node
• Modified parser to handle IN PARTITION clause between assignments and WHERE clause
• Updated tree walking and visitor patterns to traverse the new field

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
parser/ast.go	Added InPartition field to AlterTableUpdate struct and updated String() and Accept() methods
parser/parser_alter.go	Modified parser to handle IN PARTITION clause and updated comment documenting the syntax
parser/walk.go	Added Walk traversal for the new InPartition field
parser/testdata/ddl/alter_table_update_in_partition.sql	Added test case with IN PARTITION clause
parser/testdata/ddl/format/alter_table_update_in_partition.sql	Added formatting test for new syntax
parser/testdata/ddl/output/alter_table_update_in_partition.sql.golden.json	Added golden output showing parsed AST structure
parser/testdata/ddl/output/alter_table_update.sql.golden.json	Updated to include null InPartition field
parser/testdata/ddl/output/alter_table_update_with_cluster.sql.golden.json	Updated to include null InPartition field

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[coveralls]

Pull Request Test Coverage Report for Build 18861853338

Details

• 11 of 19 (57.89%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 50.241%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
parser/parser_alter.go	6	8	75.0%
parser/walk.go	1	3	33.33%
parser/ast.go	4	8	50.0%

Totals
Change from base Build 18827715548:	0.007%
Covered Lines:	7509
Relevant Lines:	14946

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💛 - Coveralls