Update v_generate_tbl_ddl view definition#736
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Address ERROR: value too long for type character varying(NNN) caused when a UNION branch produces a ddl string longer than the max VARCHAR width Redshift inferred from the other branches' expressions.
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Description of changes:
Added explicit ::VARCHAR(10240) cast to the COMMENT branch in admin.v_generate_tbl_ddl. The view uses a large UNION to build DDL statements, and Redshift resolves the ddl column type to the widest inferred VARCHAR across all
branches. The COMMENT branch could produce strings exceeding that limit (e.g., for tables with long comments or many columns), causing the value too long for type character varying(798) error. The explicit cast raises the UNION's
resolved type ceiling to 10240, matching the existing cast on the foreign key branch.
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