[WIP][SPARK-24907][SQL] DataSourceV2 based connector for JDBC#25211

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shivsood wants to merge 27 commits intoapache:masterfrom

shivsood:dsv2_jdbc

Commits on Jul 16, 2019

scaffolding : basic read/write with jdbc connector
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Commits on Jul 22, 2019

cleaned up write(append) implementation. Append will not create a table and only append if a table exist. If table does not exist, a dbtable::schema request would return a null schema and fw will r…
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comments/questions on overwrite scematics and minor log fixes
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Commits on Jul 23, 2019

first draft of read implementation. No support for partitioning or filter as yet
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Commits on Jul 24, 2019

Commits on Jul 25, 2019

cleaner more stuctured read implementation
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Commits on Aug 1, 2019

Fixed for OverWrite(with truncate). Test added in MsSqlServerIntegrationSuite.scala
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Commits on Aug 2, 2019