[GitHub] [spark] Ngone51 opened a new pull request #27302: [SPARK-30506][SQL][DOC] Document for generic file source options/configs

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Ngone51 opened a new pull request #27302: [SPARK-30506][SQL][DOC] Document for 
generic file source options/configs
URL: https://github.com/apache/spark/pull/27302
 
 
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   ### What changes were proposed in this pull request?
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   Add a new document page named *Generic File Source Options* for *Data 
Sources* menu and added following sub items:
   
   * spark.sql.files.ignoreCorruptFiles
   * spark.sql.files.ignoreMissingFiles
   * pathGlobFilter
   * recursiveFileLookup
   
   And here're snapshots of the generated document:
   <img width="1039" alt="recursive" 
src="https://user-images.githubusercontent.com/16397174/72782353-7ffb7600-3c5e-11ea-863e-091592bc1cd0.png";>
   <img width="1032" alt="missing_filter" 
src="https://user-images.githubusercontent.com/16397174/72782355-80940c80-3c5e-11ea-87ce-0878ff774a5b.png";>
   <img width="1040" alt="corrupt" 
src="https://user-images.githubusercontent.com/16397174/72782357-80940c80-3c5e-11ea-9b9c-f633e195696f.png";>
   
   
   ### Why are the changes needed?
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   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.
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   Better guidance for end-user.
   
   ### Does this PR introduce any user-facing change?
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   No, added in Spark 3.0.
   
   ### How was this patch tested?
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   Pass Jenkins.

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