Rene Treffer created SPARK-6888:
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Summary: Make DriverQuirks editable
Key: SPARK-6888
URL: https://issues.apache.org/jira/browse/SPARK-6888
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Rene Treffer
Priority: Minor
JDBC type conversion is currently handled by spark with the help of
DriverQuirks (org.apache.spark.sql.jdbc.DriverQuirks).
However some cases can't be resolved, e.g. MySQL "BIGINT UNSIGNED". (other
UNSIGNED conversions won't work either but could be resolved automatically by
using the next larger type)
An invalid type conversion (e.g. loading an unsigned bigint with the highest
bit set as a long value) causes the jdbc driver to throw an exception.
The target type is determined automatically and bound to the resulting
DataFrame where it's immutable.
Alternative solutions:
- Subqueries. Produce extra load on the server
- SQLContext / jdbc methods with schema support
- Making it possible to change the schema of data frames
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