Github user weicheng113 commented on the issue:
https://github.com/apache/spark/pull/13600
@rxin , Spark SQL DataFrameReader.jdbc only supports Long lowerBound and
upperBound also. String type primary key as lower&upper bound is also commonly
used.
The reason i am not using Spark SQL in one of my cases is that i am doing a
full data sync from SQL DB to ElasticSearch and don't do any calculation.
Selected columns from several joined tables form one ElasticSearch type.
Process is: a DB joined row --> a Entity --> a ElasticSearch document. Entity
does data conversion, validation and formatting.
if this PR is valid, i will do a final clean up and documenting.
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