Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14008#discussion_r69850899
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
 ---
    @@ -652,6 +654,160 @@ case class StringRPad(str: Expression, len: 
Expression, pad: Expression)
       override def prettyName: String = "rpad"
     }
     
    +object ParseUrl {
    +  private val HOST = UTF8String.fromString("HOST")
    +  private val PATH = UTF8String.fromString("PATH")
    +  private val QUERY = UTF8String.fromString("QUERY")
    +  private val REF = UTF8String.fromString("REF")
    +  private val PROTOCOL = UTF8String.fromString("PROTOCOL")
    +  private val FILE = UTF8String.fromString("FILE")
    +  private val AUTHORITY = UTF8String.fromString("AUTHORITY")
    +  private val USERINFO = UTF8String.fromString("USERINFO")
    +  private val REGEXPREFIX = "(&|^)"
    +  private val REGEXSUBFIX = "=([^&]*)"
    +}
    +
    +/**
    + * Extracts a part from a URL
    + */
    +@ExpressionDescription(
    +  usage = "_FUNC_(url, partToExtract[, key]) - extracts a part from a URL",
    +  extended = """Parts: HOST, PATH, QUERY, REF, PROTOCOL, AUTHORITY, FILE, 
USERINFO.
    +    Key specifies which query to extract.
    +    Examples:
    +      > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'HOST')
    +      'spark.apache.org'
    +      > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'QUERY')
    +      'query=1'
    +      > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'QUERY', 
'query')
    +      '1'""")
    +case class ParseUrl(children: Seq[Expression])
    +  extends Expression with ImplicitCastInputTypes with CodegenFallback {
    +
    +  override def nullable: Boolean = true
    +  override def inputTypes: Seq[DataType] = 
Seq.fill(children.size)(StringType)
    +  override def dataType: DataType = StringType
    +  override def prettyName: String = "parse_url"
    +
    +  // If the url is a constant, cache the URL object so that we don't need 
to convert url
    +  // from UTF8String to String to URL for every row.
    +  @transient private lazy val cachedUrl = stringExprs(0) match {
    +    case Literal(url: UTF8String, _) => getUrl(url)
    +    case _ => null
    +  }
    +
    +  // If the key is a constant, cache the Pattern object so that we don't 
need to convert key
    +  // from UTF8String to String to StringBuilder to String to Pattern for 
every row.
    +  @transient private lazy val cachedPattern = stringExprs(2) match {
    +    case Literal(key: UTF8String, _) => getPattern(key)
    +    case _ => null
    +  }
    +
    +  private lazy val stringExprs = children.toArray
    +  import ParseUrl._
    +
    +  override def checkInputDataTypes(): TypeCheckResult = {
    +    if (children.size > 3 || children.size < 2) {
    +      TypeCheckResult.TypeCheckFailure(s"$prettyName function requires two 
or three arguments")
    +    } else {
    +      super[ImplicitCastInputTypes].checkInputDataTypes()
    +    }
    +  }
    +
    +  private def getPattern(key: UTF8String): Pattern = {
    +    if (key != null) {
    +      Pattern.compile(REGEXPREFIX + key.toString + REGEXSUBFIX)
    +    } else {
    +      null
    +    }
    +  }
    +
    +  private def getUrl(url: UTF8String): URL = {
    +    try {
    +      new URL(url.toString)
    +    } catch {
    +      case e: MalformedURLException => null
    +    }
    +  }
    +
    +  private def extractValueFromQuery(query: UTF8String, pattern: Pattern): 
UTF8String = {
    +    val m = pattern.matcher(query.toString)
    +    if (m.find()) {
    +      UTF8String.fromString(m.group(2))
    +    } else {
    +      null
    +    }
    +  }
    +
    +  private def extractFromUrl(url: URL, partToExtract: UTF8String): 
UTF8String = {
    +    if (partToExtract.equals(HOST)) {
    +      UTF8String.fromString(url.getHost)
    +    } else if (partToExtract.equals(PATH)) {
    +      UTF8String.fromString(url.getPath)
    +    } else if (partToExtract.equals(QUERY)) {
    +      UTF8String.fromString(url.getQuery)
    +    } else if (partToExtract.equals(REF)) {
    +      UTF8String.fromString(url.getRef)
    +    } else if (partToExtract.equals(PROTOCOL)) {
    +      UTF8String.fromString(url.getProtocol)
    +    } else if (partToExtract.equals(FILE)) {
    +      UTF8String.fromString(url.getFile)
    +    } else if (partToExtract.equals(AUTHORITY)) {
    +      UTF8String.fromString(url.getAuthority)
    +    } else if (partToExtract.equals(USERINFO)) {
    +      UTF8String.fromString(url.getUserInfo)
    +    } else {
    +      null
    +    }
    +  }
    +
    +  private def parseUrlWithoutKey(url: UTF8String, partToExtract: 
UTF8String): UTF8String = {
    +    if (url != null && partToExtract != null) {
    +      if (cachedUrl ne null) {
    +        extractFromUrl(cachedUrl, partToExtract)
    +      } else {
    +        val currentUrl = getUrl(url)
    +        if (currentUrl ne null) {
    +          extractFromUrl(currentUrl, partToExtract)
    +        } else {
    +          null
    +        }
    +      }
    +    } else {
    +      null
    +    }
    +  }
    +
    +  override def eval(input: InternalRow): Any = {
    +    val url = stringExprs(0).eval(input).asInstanceOf[UTF8String]
    +    val partToExtract = stringExprs(1).eval(input).asInstanceOf[UTF8String]
    +    if (stringExprs.size == 2) {
    +      parseUrlWithoutKey(url, partToExtract)
    +    } else { // QUERY with key
    +      if (QUERY.equals(partToExtract)) {
    --- End diff --
    
    in scala we can just use `==`, it's same with equals


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