MaxGekk commented on code in PR #48500:
URL: https://github.com/apache/spark/pull/48500#discussion_r1807894295
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/urlExpressions.scala:
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@@ -169,6 +169,37 @@ object ParseUrl {
private val REGEXSUBFIX = "=([^&]*)"
}
+/**
+ * Extracts a part from a URL
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(url, partToExtract[, key]) - Extracts a part from a URL.",
+ examples = """
+ 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_('inva lid://spark.apache.org/path?query=1', 'QUERY');
+ NULL
+ > SELECT _FUNC_('http://spark.apache.org/path?query=1', 'QUERY',
'query');
+ 1
Review Comment:
Could you add an example which distiguish the new expression from
`ParseUrl`, actually when it returns NULL.
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