Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21626#discussion_r198147668
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/InferSchema.scala
---
@@ -0,0 +1,169 @@
+/*
+ * 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.aggregate
+
+import scala.util.Try
+
+import com.fasterxml.jackson.core.JsonFactory
+
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{AttributeReference,
Expression, ExpressionDescription, JsonExprUtils}
+import org.apache.spark.sql.catalyst.json.{CreateJacksonParser,
JsonInferSchema, JSONOptions}
+import
org.apache.spark.sql.catalyst.json.JsonInferSchema.compatibleRootType
+import org.apache.spark.sql.catalyst.util.DropMalformedMode
+import org.apache.spark.sql.types.{DataType, StringType, StructType}
+import org.apache.spark.unsafe.types.UTF8String
+
+@ExpressionDescription(
+ usage = """_FUNC_(expr, [options]) - Infers schema for JSON `expr` by
using JSON `options`.""",
+ examples = """
+ Examples:
+ > CREATE TEMPORARY VIEW json_table(json) AS SELECT * FROM VALUES
('{"a":1}'), ('{"a": 3}');
+ > SELECT _FUNC_(json) FROM json_table;
--- End diff --
There's inline table expression: `SELECT _FUNC_(json) FROM VALUES
('{"a":1}'), ('{"a": 3}') json_table(json)` FYI.
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