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### What changes were proposed in this pull request? Document ALTER DATABSE statement in SQL Reference Guide. ### Why are the changes needed? Currently Spark lacks documentation on the supported SQL constructs causing confusion among users who sometimes have to look at the code to understand the usage. This is aimed at addressing this issue. ### Does this PR introduce any user-facing change? Yes. **Before:** There was no documentation for this. **After.** <img width="1234" alt="Screen Shot 2019-08-28 at 1 51 13 PM" src="https://user-images.githubusercontent.com/14225158/63891854-fc817580-c99a-11e9-918e-6b305edf92e6.png"> <img width="1234" alt="Screen Shot 2019-08-28 at 1 51 27 PM" src="https://user-images.githubusercontent.com/14225158/63891869-0acf9180-c99b-11e9-91a4-04d870474a40.png"> ### How was this patch tested? Tested using jykyll build --serve Closes #25523 from dilipbiswal/ref-doc-alterdb. Lead-authored-by: Dilip Biswal <dbiswal@us.ibm.com> Co-authored-by: Xiao Li <gatorsmile@gmail.com> Signed-off-by: Xiao Li <gatorsmile@gmail.com> |
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