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From dongjoon-hyun <...@git.apache.org>
Subject [GitHub] spark pull request #14008: [SPARK-16281][SQL] Implement parse_url SQL functi...
Date Fri, 01 Jul 2016 19:29:36 GMT
Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14008#discussion_r69345860
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
    @@ -652,6 +656,129 @@ 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')\n 'spark.apache.org'
    +      > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'QUERY')\n 'query=1'
    +      > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'QUERY', 'query')\n
'1'""")
    +case class ParseUrl(children: Seq[Expression])
    +  extends Expression with ImplicitCastInputTypes with CodegenFallback {
    +
    +  override def nullable = true
    --- End diff --
    
    Public functions need explicit type declaration.


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