gengliangwang opened a new pull request #23800: [SPARK-26673][SQL] File source V2: remove duplicated broadcast object in FileWriterFactory URL: https://github.com/apache/spark/pull/23800 ## What changes were proposed in this pull request? This is a followup PR to fix two issues in #23601: 1. the class `FileWriterFactory` contains `conf: SerializableConfiguration` as a member, which is duplicated with `WriteJobDescription. serializableHadoopConf `. By removing it we can reduce the broadcast task binary size by around 70KB 2. The test suite `OrcV1QuerySuite`/`OrcV1QuerySuite`/`OrcV1PartitionDiscoverySuite` didn't change the configuration `SQLConf.USE_V1_SOURCE_WRITER_LIST` to `"orc`. We should set the conf. ## How was this patch tested? Unit test
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