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### What changes were proposed in this pull request? JDBC connection provider API and embedded connection providers already added to the code but no in-depth description about the internals. In this PR I've added both user and developer documentation and additionally added an example custom JDBC connection provider. ### Why are the changes needed? No documentation and example custom JDBC provider. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? ``` cd docs/ SKIP_API=1 jekyll build ``` <img width="793" alt="Screenshot 2021-02-02 at 16 35 43" src="https://user-images.githubusercontent.com/18561820/106623428-e48d2880-6574-11eb-8d14-e5c2aa7c37f1.png"> Closes #31384 from gaborgsomogyi/SPARK-31816. Authored-by: Gabor Somogyi <gabor.g.somogyi@gmail.com> Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org> |
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| scala/org/apache/spark/examples | ||
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