Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7485#discussion_r36110763
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/GetJsonObject.scala
---
@@ -0,0 +1,326 @@
+/*
+ * 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
+
+import java.io.{StringWriter, ByteArrayOutputStream}
+
+import com.fasterxml.jackson.core._
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
+import org.apache.spark.sql.types.{StringType, DataType}
+import org.apache.spark.unsafe.types.UTF8String
+
+import scala.util.parsing.combinator.RegexParsers
+
+private[this] sealed trait PathInstruction
+private[this] object PathInstruction {
+ private[expressions] case object Subscript extends PathInstruction
+ private[expressions] case object Wildcard extends PathInstruction
+ private[expressions] case object Key extends PathInstruction
+ private[expressions] case class Index(index: Long) extends
PathInstruction
+ private[expressions] case class Named(name: String) extends
PathInstruction
+}
+
+private[this] sealed trait WriteStyle
+private[this] object WriteStyle {
+ private[expressions] case object RawStyle extends WriteStyle
+ private[expressions] case object QuotedStyle extends WriteStyle
+ private[expressions] case object FlattenStyle extends WriteStyle
+}
+
+private[this] object JsonPathParser extends RegexParsers {
+ import PathInstruction._
+
+ def root: Parser[Char] = '$'
+
+ def long: Parser[Long] = "\\d+".r ^? {
+ case x => x.toLong
+ }
+
+ // parse `[*]` and `[123]` subscripts
+ def subscript: Parser[List[PathInstruction]] =
+ for {
+ operand <- '[' ~> ('*' ^^^ Wildcard | long ^^ Index) <~ ']'
+ } yield {
+ Subscript :: operand :: Nil
+ }
+
+ // parse `.name` or `['name']` child expressions
+ def named: Parser[List[PathInstruction]] =
+ for {
+ name <- '.' ~> "[^\\.\\[]+".r | "[\\'" ~> "[^\\'\\?]+" <~ "\\']"
+ } yield {
+ Key :: Named(name) :: Nil
+ }
+
+ // child wildcards: `..`, `.*` or `['*']`
+ def wildcard: Parser[List[PathInstruction]] =
+ (".*" | "['*']") ^^^ List(Wildcard)
+
+ def node: Parser[List[PathInstruction]] =
+ wildcard |
+ named |
+ subscript
+
+ val expression: Parser[List[PathInstruction]] = {
+ phrase(root ~> rep(node) ^^ (x => x.flatten))
+ }
+
+ def parse(str: String): Option[List[PathInstruction]] = {
+ this.parseAll(expression, str) match {
+ case Success(result, _) =>
+ Some(result)
+
+ case NoSuccess(msg, next) =>
+ None
+ }
+ }
+}
+
+private[this] object GetJsonObject {
+ private val jsonFactory = new JsonFactory()
+
+ // Enabled for Hive compatibility
+ jsonFactory.enable(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS)
+}
+
+case class GetJsonObject(
+ jsonExpression: Expression,
+ pathExpression: Expression)
+ extends Expression
--- End diff --
it could extends BinaryExpression
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