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[SPARK-21330][SQL] Bad partitioning does not allow to read a JDBC tab…
…le with extreme values on the partition column ## What changes were proposed in this pull request? An overflow of the difference of bounds on the partitioning column leads to no data being read. This patch checks for this overflow. ## How was this patch tested? New unit test. Author: Andrew Ray <ray.andrew@gmail.com> Closes #18800 from aray/SPARK-21330. (cherry picked from commit 25826c7) Signed-off-by: Sean Owen <sowen@cloudera.com>
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