Github user rama-mullapudi commented on the pull request:
https://github.com/apache/spark/pull/8374#issuecomment-143747859
Intent of the change is make field metadata available to getJDBCType so it
can be used by dialects to handle special cases. One I was trying to solve is
by default java string types are stored as TEXT data type in database and most
databases doesn't support TEXT data type, so trying to use VARCHAR which needs
max length to create a varchar field in database.
What would be the best way to handle custom dialects, since its
developerapi and can change.
Thanks for looking in to the change and will update code to use
java.sql.Types.VARCHAR instead of java.sql.Types.CHAR
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