Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/22152#discussion_r211626457 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala --- @@ -2528,4 +2529,27 @@ class DataFrameSuite extends QueryTest with SharedSQLContext { checkAnswer(aggPlusFilter1, aggPlusFilter2.collect()) } } + + test("SPARK-25159: json schema inference should only trigger one job") { + withTempPath { path => + // This test is to prove that the `JsonInferSchema` does not use `RDD#toLocalIterator` which + // triggers one Spark job per RDD partition. + Seq(1 -> "a", 2 -> "b").toDF("i", "p") + // The data set has 2 partitions, so Spark will write at least 2 json files. + // Use a non-splittable compression (gzip), to make sure the json scan RDD has at lease 2 --- End diff -- nit: `at least`
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