Re: [PR] [SPARK-45827][SQL] Add Variant data type in Spark. [spark]

["cloud-fan (via GitHub)" <gi...@apache.org>]

cloud-fan commented on code in PR #43707:
URL: https://github.com/apache/spark/pull/43707#discussion_r1389081918


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/variant/variantExpressions.scala:
##########
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions.variant
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types._
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+  usage = "_FUNC_(jsonStr) - Parse a JSON string as an Variant value. Throw an exception when the string is not valid JSON value.",
+  examples =
+    """
+    Examples:
+  """,
+  since = "4.0.0",
+  group = "variant_funcs"
+)
+// scalastyle:on line.size.limit
+case class ParseJson(child: Expression) extends UnaryExpression
+  with NullIntolerant with ExpectsInputTypes with CodegenFallback {
+  override def inputTypes: Seq[AbstractDataType] = StringType :: Nil
+
+  override def dataType: DataType = VariantType
+
+  override def nullable: Boolean = false

Review Comment:
   it at lease should be `child.nullable`



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