Add support for MySQL ALTER TABLE ... [DEFAULT] COLLATE [=] collation_name syntax #2204
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Description
This PR adds support for the following MySQL-compatible ALTER TABLE syntax:
Changes
Updated JavaCC grammar to recognize [DEFAULT] COLLATE [=] collation_name as a valid ALTER TABLE clause
Introduced a new AlterOperation.COLLATE operation to distinguish this clause from CONVERT TO CHARACTER SET ...
Added defaultCollateSpecified and hasEqualForCollate flags to AlterExpression to track optional parts of the syntax
Modified toString() in AlterExpression to deparse the new syntax correctly