Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9940#discussion_r50167182
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilterSuite.scala
---
@@ -330,9 +331,56 @@ class ParquetFilterSuite extends QueryTest with
ParquetTest with SharedSQLContex
// If the "c = 1" filter gets pushed down, this query will throw
an exception which
// Parquet emits. This is a Parquet issue (PARQUET-389).
+ val df = sqlContext.read.parquet(pathOne, pathTwo).filter("c =
1").selectExpr("c", "b", "a")
checkAnswer(
- sqlContext.read.parquet(pathOne, pathTwo).filter("c =
1").selectExpr("c", "b", "a"),
+ df,
(1 to 1).map(i => Row(i, i.toString, null)))
+
+ // The fields "a" and "c" only exist in one Parquet file.
+ df.schema.fields.foreach { f =>
+ if (f.name == "a" || f.name == "c") {
+ assert(f.metadata.contains("optional"))
+ }
+ }
+
+ val pathThree = s"${dir.getCanonicalPath}/table3"
+ df.write.parquet(pathThree)
+
+ // We will remove the temporary metadata when writing Parquet file.
+ sqlContext.read.parquet(pathThree).schema.fields.foreach { f =>
+ assert(!f.metadata.contains("optional"))
+ }
--- End diff --
```scala
assert(sqlContext.read.parquet(pathThree).schema.forall(_.metadata.contains("optional")))
```
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