fqaiser94 commented on a change in pull request #29522:
URL: https://github.com/apache/spark/pull/29522#discussion_r475908115
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
##########
@@ -1452,4 +1452,89 @@ class ColumnExpressionSuite extends QueryTest with
SharedSparkSession {
.select($"struct_col".withField("a.c", lit(3)))
}.getMessage should include("Ambiguous reference to fields")
}
+
+ test("SPARK-32641: extracting field from non-null struct column after
withField should return " +
+ "field value") {
+ // extract newly added field
+ checkAnswerAndSchema(
+ structLevel1.withColumn("a", $"a".withField("d", lit(4)).getField("d")),
+ Row(4) :: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = false))))
+
+ // extract newly replaced field
+ checkAnswerAndSchema(
+ structLevel1.withColumn("a", $"a".withField("a", lit(4)).getField("a")),
+ Row(4) :: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = false))))
+
+ // add new field, extract another field from original struct
+ checkAnswerAndSchema(
+ structLevel1.withColumn("a", $"a".withField("d", lit(4)).getField("c")),
+ Row(3):: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = false))))
+
+ // replace field, extract another field from original struct
+ checkAnswerAndSchema(
+ structLevel1.withColumn("a", $"a".withField("a", lit(4)).getField("c")),
+ Row(3):: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = false))))
+ }
+
+ test("SPARK-32641: extracting field from null struct column after withField
should return " +
+ "null if the original struct was null") {
+ // extract newly added field
+ checkAnswerAndSchema(
+ nullStructLevel1.withColumn("a", $"a".withField("d",
lit(4)).getField("d")),
+ Row(null) :: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = true))))
+
+ // extract newly replaced field
+ checkAnswerAndSchema(
+ nullStructLevel1.withColumn("a", $"a".withField("a",
lit(4)).getField("a")),
+ Row(null):: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = true))))
+
+ // add new field, extract another field from original struct
+ checkAnswerAndSchema(
+ nullStructLevel1.withColumn("a", $"a".withField("d",
lit(4)).getField("c")),
+ Row(null):: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = true))))
+
+ // replace field, extract another field from original struct
+ checkAnswerAndSchema(
+ nullStructLevel1.withColumn("a", $"a".withField("a",
lit(4)).getField("c")),
+ Row(null):: Nil,
+ StructType(Seq(StructField("a", IntegerType, nullable = true))))
+ }
+
+ test("SPARK-32641: extracting field from nullable struct column which
contains both null and " +
+ "non-null values after withField should return null if the original struct
was null") {
+ val df = structLevel1.union(nullStructLevel1).cache()
Review comment:
not necessary, rewrote this line to avoid it.
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