dongjoon-hyun commented on a change in pull request #29573:
URL: https://github.com/apache/spark/pull/29573#discussion_r592099376
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File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/ReadSchemaTest.scala
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@@ -72,6 +72,58 @@ trait ReadSchemaTest extends QueryTest with
SharedSparkSession {
val options: Map[String, String] = Map.empty[String, String]
}
+trait ArrayWithNestedStructTest extends ReadSchemaTest {
Review comment:
The goal of `ReadSchemaTest` is the following
(https://github.com/apache/spark/pull/29573/files#diff-ff46c4f16bf7cb1f09e74b70b0ba3bc6be62203824a2fe16c4c473e34fd18d7fR24).
```
Read schema suites have the following hierarchy and aims to guarantee users
a backward-compatible read-schema change coverage
```
To simply put, it was about a kind of acceptable schema evolution. However,
the new test suites `ArrayWithNestedStructTest` and `MapWithNestedStructTest`
seems to have no schema evolution.
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