[jira] [Created] (SPARK-28152) ShortType and FloatTypes are not correctly mapped to right JDBC types when using JDBC connector

["Shiv Prashant Sood (JIRA)" <ji...@apache.org>]

Shiv Prashant Sood created SPARK-28152:
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             Summary: ShortType and FloatTypes are not correctly mapped to right JDBC types when using JDBC connector
                 Key: SPARK-28152
                 URL: https://issues.apache.org/jira/browse/SPARK-28152
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.3, 3.0.0
            Reporter: Shiv Prashant Sood


ShortType and FloatTypes are not correctly mapped to right JDBC types when using JDBC connector. This results in tables or spark data frame being created with unintended types.

Some example issue
 * Write from df with column type results in a SQL table of with column type as INTEGER as opposed to SMALLINT. Thus a larger table that expected.
 * read results in a dataframe with type INTEGER as opposed to ShortType  

FloatTypes have a issue with read path. In the write path Spark data type 'FloatType' is correctly mapped to JDBC equivalent data type 'Real'. But in the read path when JDBC data types need to be converted to Catalyst data types ( getCatalystType) 'Real' gets incorrectly gets mapped to 'DoubleType' rather than 'FloatType'.

 



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