Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/12591#discussion_r60797653
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala
---
@@ -327,6 +380,37 @@ class FileStreamSourceSuite extends
FileStreamSourceTest with SharedSQLContext {
Utils.deleteRecursively(tmp)
}
+ test("read from parquet files with changing schema") {
+
+ withTempDirs { case (src, tmp) =>
+ // Add a file so that we can infer its schema
+ AddParquetFileData.writeToFile(Seq("value0").toDF("k"), src, tmp)
+
+ val fileSource = createFileStreamSource("parquet",
src.getCanonicalPath)
+ val parquetData = fileSource.toDF()
+
+ require(parquetData.schema === StructType(Seq(StructField("k",
StringType))))
+
+ // After creating DF and before starting stream, add data with
different schema
+ // Should not affect the inferred schema any more
+ AddParquetFileData.writeToFile(Seq("value1").toDF("k"), src, tmp)
--- End diff --
nit: k -> v
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