turboFei commented on a change in pull request #25701: [SPARK-29000][SQL] 
Decimal precision overflow when don't allow precision loss
URL: https://github.com/apache/spark/pull/25701#discussion_r321596864
 
 

 ##########
 File path: 
sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveQuerySuite.scala
 ##########
 @@ -1224,6 +1224,15 @@ class HiveQuerySuite extends HiveComparisonTest with 
SQLTestUtils with BeforeAnd
       }
     }
   }
+
+  test("SPARK-29000: arithmetic computation overflow when don't allow decimal 
precision loss ") {
+    val allow = sql("set spark.sql.decimalOperations.allowPrecisionLoss")
+    val originValue = allow.collect().apply(0).apply(1)
+    sql("set spark.sql.decimalOperations.allowPrecisionLoss=false")
+    val df = sql("select case when 1=2 then 1 else 
100.000000000000000000000000 end * 1")
+    QueryTest.checkAnswer(df, Array(Row(100)))
+    sql(s"set spark.sql.decimalOperations.allowPrecisionLoss=$originValue")
+  }
 
 Review comment:
   I have added relative tests in TypeCoericionSuite.

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