Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7533#discussion_r35210639
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1777,8 +1777,31 @@ object functions {
def instr(str: Column, substring: String): Column =
StringInstr(str.expr, lit(substring).expr)
/**
- * Locate the position of the first occurrence of substr in a string
column.
+ * Returns the substring from string str before count occurrences of the
delimiter delim.
+ * If count is positive, everything the left of the final delimiter
(counting from left) is
+ * returned. If count is negative, every to the right of the final
delimiter (counting from the
+ * right) is returned. substring_index performs a case-sensitive match
when searching for delim.
*
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def substring_index(str: String, delim: String, count: Int): Column =
--- End diff --
Let's remove this version of API. @rxin actually made some clean up, and
removed the `string` (the column name) version API.
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