Github user janplus commented on a diff in the pull request: https://github.com/apache/spark/pull/14008#discussion_r69251673 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala --- @@ -653,6 +655,128 @@ case class StringRPad(str: Expression, len: Expression, pad: Expression) } /** + * 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\n" + + "key specifies which query to extract\n" + + "Examples:\n" + + " > SELECT _FUNC_('http://spark.apache.org/path?query=1', " + + "'HOST') FROM src LIMIT 1;\n" + " 'spark.apache.org'\n" + + " > SELECT _FUNC_('http://spark.apache.org/path?query=1', " + + "'QUERY') FROM src LIMIT 1;\n" + " 'query=1'\n" + + " > SELECT _FUNC_('http://spark.apache.org/path?query=1', " + + "'QUERY', 'query') FROM src LIMIT 1;\n" + " '1'") +case class ParseUrl(children: Expression*) --- End diff -- The parameter `key` can only be present when `partToExtract` is `QUERY`. So there are two parameters call and three parameters call. I have not figured out a better way to accomplish this. I'll keep on trying to do it better. If there is any advice, that will be very helpful. Thanks again.
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