aokolnychyi commented on code in PR #54427:
URL: https://github.com/apache/spark/pull/54427#discussion_r2850426374
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sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala:
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@@ -2663,6 +2663,24 @@ class CachedTableSuite extends QueryTest
}
}
+ test("ALTER TABLE invalidates cached table") {
+ val t = "testcat.tbl"
+ withTable(t) {
+ sql(s"CREATE TABLE $t (id int, data string) USING foo")
+ sql(s"INSERT INTO $t VALUES (1, 'a'), (2, 'b')")
+
+ sql(s"CACHE TABLE $t")
+ assertCached(sql(s"SELECT * FROM $t"))
+ checkAnswer(sql(s"SELECT * FROM $t"), Seq(Row(1, "a"), Row(2, "b")))
+
+ sql(s"ALTER TABLE $t ADD COLUMN new_col int")
+
+ val result = sql(s"SELECT * FROM $t ORDER BY id")
+ assertCached(result)
+ checkAnswer(result, Seq(Row(1, "a", null), Row(2, "b", null)))
Review Comment:
This would return successfully but use the cached state (old schema), which
breaks the assumption that session changes are always propagated and visible.
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