Gabor Somogyi 0a37a95224 [SPARK-31816][SQL][DOCS] Added high level description about JDBC connection providers for users/developers ... ### 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>		2021-02-10 12:28:28 +09:00
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src/main	[SPARK-31816][SQL][DOCS] Added high level description about JDBC connection providers for users/developers	2021-02-10 12:28:28 +09:00
pom.xml	[SPARK-33662][BUILD] Setting version to 3.2.0-SNAPSHOT	2020-12-04 14:10:42 -08:00