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[SPARK-14158][SQL] implement buildReader for json data source
## What changes were proposed in this pull request? This PR implements buildReader for json data source and enable it in the new data source code path. ## How was this patch tested? existing tests Author: Wenchen Fan <wenchen@databricks.com> Closes #11960 from cloud-fan/json.
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- sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala 2 additions, 2 deletions.../spark/sql/execution/datasources/FileSourceStrategy.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/HadoopFileLinesReader.scala 51 additions, 0 deletions...ark/sql/execution/datasources/HadoopFileLinesReader.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JSONRelation.scala 36 additions, 1 deletion...e/spark/sql/execution/datasources/json/JSONRelation.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonParser.scala 1 addition, 1 deletion.../spark/sql/execution/datasources/json/JacksonParser.scala
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