[branch-2.1][Refactor](jdbc catalog) Enhance Field Handling in JdbcFieldSchema Using Optional for Better Null Safety #34730
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…ing Optional for Better Null Safety
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Proposed changes
Issue Number: close #xxx
pick #34621
In some cases, using Resultset.getxxx cannot correctly handle null data, so I use Optional to enhance the fields of JdbcFieldSchema for better type mapping when some results are null.
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