chenhao-db commented on code in PR #46123:
URL: https://github.com/apache/spark/pull/46123#discussion_r1574033907
##########
python/pyspark/sql/tests/test_functions.py:
##########
@@ -1315,6 +1315,35 @@ def test_parse_json(self):
self.assertEqual("""{"a":1}""", actual["var"])
self.assertEqual("""{"b":[{"c":"str2"}]}""", actual["var_lit"])
+ def test_variant_expressions(self):
+ df = self.spark.createDataFrame([Row(json="""{ "a" : 1 }"""),
Row(json="""{ "b" : 2 }""")])
+ v = F.parse_json(df.json)
+
+ def check(resultDf, expected):
+ self.assertEqual([r[0] for r in resultDf.collect()], expected)
+
+ check(df.select(F.is_variant_null(v)), [False, False])
+ check(df.select(F.schema_of_variant(v)), ["STRUCT<a: BIGINT>",
"STRUCT<b: BIGINT>"])
+ check(df.select(F.schema_of_variant_agg(v)), ["STRUCT<a: BIGINT, b:
BIGINT>"])
+
+ check(df.select(F.variant_get(v, "$.a", "int")), [1, None])
+ check(df.select(F.variant_get(v, "$.b", "int")), [None, 2])
+ check(df.select(F.variant_get(v, "$.a", "double")), [1.0, None])
+
+ with self.assertRaises(SparkRuntimeException) as ex:
+ df.select(F.variant_get(v, "$.a", "binary")).collect()
Review Comment:
> only `variant_get` cast an exception, right?
Correct. We don't need to include more test cases in this PR because they
have already been extensively tested in
[VariantExpressionSuite](https://github.com/apache/spark/blob/9f34b8eca2f3578367352ec28532e29fe3a91864/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/variant/VariantExpressionSuite.scala#L251).
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