[GitHub] [spark] fuwhu opened a new pull request #26230: [SPARK-21287][SQL] Move the validation of fetch size from JDBCOptions to JdbcDialect

[GitBox <gi...@apache.org>]

fuwhu opened a new pull request #26230: [SPARK-21287][SQL] Move the validation of fetch size from JDBCOptions to JdbcDialect
URL: https://github.com/apache/spark/pull/26230
 
 
   ### What changes were proposed in this pull request?
       Move the validation of fetch size from JDBCOptions to JdbcDialect, so that different dialects can have different validation logic for fetch size property.
   
   ### Why are the changes needed?
   To fix  #SPARK-21287 , namely to support data fetch in stream manner  against MySQL database.
   
   ### Does this PR introduce any user-facing change?
   No
   
   ### How was this patch tested?
   Unit tests (JDBCSuite).
   

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