yaooqinn opened a new pull request, #45976:
URL: https://github.com/apache/spark/pull/45976

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   This PR is kind of a follow-up of SPARK-45905 but for JDBC datasource 
readings´╝î which truncates exceed decimals with scale first instead of precision
   
   ### Why are the changes needed?
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   To produce reasonable decimal values from jdbc sources.
   
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   yes, LEGACY_RETAIN_FRACTION_DIGITS_FIRST can help to restore
   
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   modified tests
   
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