Github user janplus commented on a diff in the pull request: https://github.com/apache/spark/pull/14008#discussion_r69385849 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringExpressionsSuite.scala --- @@ -725,4 +725,51 @@ class StringExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper { checkEvaluation(FindInSet(Literal("abf"), Literal("abc,b,ab,c,def")), 0) checkEvaluation(FindInSet(Literal("ab,"), Literal("abc,b,ab,c,def")), 0) } + + test("ParseUrl") { + def checkParseUrl(expected: String, urlStr: String, partToExtract: String): Unit = { + checkEvaluation( + ParseUrl(Seq(Literal.create(urlStr, StringType), + Literal.create(partToExtract, StringType))), expected) + } + def checkParseUrlWithKey( + expected: String, urlStr: String, + partToExtract: String, key: String): Unit = { + checkEvaluation( + ParseUrl(Seq(Literal.create(urlStr, StringType), Literal.create(partToExtract, StringType), + Literal.create(key, StringType))), expected) + } + + checkParseUrl("spark.apache.org", "http://spark.apache.org/path?query=1", "HOST") + checkParseUrl("/path", "http://spark.apache.org/path?query=1", "PATH") + checkParseUrl("query=1", "http://spark.apache.org/path?query=1", "QUERY") + checkParseUrl("Ref", "http://spark.apache.org/path?query=1#Ref", "REF") + checkParseUrl("http", "http://spark.apache.org/path?query=1", "PROTOCOL") + checkParseUrl("/path?query=1", "http://spark.apache.org/path?query=1", "FILE") + checkParseUrl("spark.apache.org:8080", "http://spark.apache.org:8080/path?query=1", "AUTHORITY") + checkParseUrl("userinfo", "http://useri...@spark.apache.org/path?query=1", "USERINFO") + checkParseUrlWithKey("1", "http://spark.apache.org/path?query=1", "QUERY", "query") + + // Null checking + checkParseUrl(null, null, "HOST") + checkParseUrl(null, "http://spark.apache.org/path?query=1", null) + checkParseUrl(null, null, null) + checkParseUrl(null, "test", "HOST") + checkParseUrl(null, "http://spark.apache.org/path?query=1", "NO") + checkParseUrlWithKey(null, "http://spark.apache.org/path?query=1", "HOST", "query") + checkParseUrlWithKey(null, "http://spark.apache.org/path?query=1", "QUERY", "quer") + checkParseUrlWithKey(null, "http://spark.apache.org/path?query=1", "QUERY", null) + checkParseUrlWithKey(null, "http://spark.apache.org/path?query=1", "QUERY", "") + + // exceptional cases + intercept[java.util.regex.PatternSyntaxException] { --- End diff -- Yes, definitely I can do that. In fact I have finished it. But before I do the commit, let us get thought it first. In `checkAnalysis` method for `LogicalPlan`, the only method will be called for `Expression` is `checkInputDataTypes` https://github.com/apache/spark/blob/d1e8108854deba3de8e2d87eb4389d11fb17ee57/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala#L64 Which means we can only implement this validation in `checkInputDataTypes` of `ParseUrl`. In that circumstance spark will give the AnalysisException like this > org.apache.spark.sql.AnalysisException: cannot resolve 'parse_url("http://spark.apache.org/path?", "QUERY", "???")' due to data type mismatch: wrong key "???"; line 1 pos 0 But obviously this should not be a data type mismatch. This message may confuse the users. Also the different message for **Literal** `key` and **Not Literal** `key` may make them confused too. Otherwise, if we do not validate the **Literal** `key`, the `Executor` will get an exception at the first row. It seems not that unacceptable. So compared the both sides, I think we should not do the Literal `key` validation. How do you think about this?
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