ORA-14061: data type or length of an index partitioning column may not be change

oracle

ORA-14061: data type or length of an index partitioning column may not be changed
Cause: User issued ALTER TABLE statement attempting to modify data type and/or length of a column used to partition some index defined on the table named in ALTER TABLE statement, which is illegal
Action: Avoid modifying data type and/or length of index partitioning column(s)

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