caican created SPARK-38444:
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Summary: Automatically calculate the upper and lower bounds of
partitions when no specified partition related params
Key: SPARK-38444
URL: https://issues.apache.org/jira/browse/SPARK-38444
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.2
Reporter: caican
when access rdbms, such as mysql, if partitionColumn, lowerBound, upperBound,
numPartitions are not specified, by default only one partition to scan database
is working.
It makes load data from database slow and makes it difficult for users to
configure multiple parameters to improve parallelism.
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