[GitHub] [spark] WangGuangxin opened a new pull request #24043: [SPARK-11412][SQL]Support merge schema for ORC

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WangGuangxin opened a new pull request #24043: [SPARK-11412][SQL]Support merge schema for ORC
URL: https://github.com/apache/spark/pull/24043
 
 
   ## What changes were proposed in this pull request?
   
   Currently, ORC's `inferSchema` is implemented as randomly choosing one ORC file and reading its schema. 
   
   This PR follows the behavior of Parquet, it implements merge schemas logic by reading all ORC files in parallel through a spark job. 
   
   Users can enable merge schema by `spark.read.orc("xxx").option("mergeSchema", "true")` or by setting `spark.sql.orc.mergeSchema` to `true`, the prior one has higher priority.
   
   ## How was this patch tested?
   tested by UT OrcUtilsSuite.scala

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