Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6762#discussion_r32589836
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1339,19 +1339,361 @@ object functions {
//////////////////////////////////////////////////////////////////////////////////////////////
/**
- * Computes the length of a given string value
+ * Computes the length of a given string value.
* @group string_funcs
* @since 1.5.0
*/
def strlen(e: Column): Column = StringLength(e.expr)
/**
- * Computes the length of a given string column
+ * Computes the length of a given string column.
* @group string_funcs
* @since 1.5.0
*/
def strlen(columnName: String): Column = strlen(Column(columnName))
+ /**
+ * Trim the spaces from both ends for the specified string value.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def trim(e: Column): Column = StringTrim(e.expr)
+
+ /**
+ * Trim the spaces from both ends for the specified column.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def trim(columnName: String): Column = trim(Column(columnName))
+
+ /**
+ * Trim the spaces from left end for the specified string value.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def ltrim(e: Column): Column = StringTrimLeft(e.expr)
+
+ /**
+ * Trim the spaces from left end for the specified column.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def ltrim(columnName: String): Column = ltrim(Column(columnName))
+
+ /**
+ * Trim the spaces from right end for the specified string value.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def rtrim(e: Column): Column = StringTrimRight(e.expr)
+
+ /**
+ * Trim the spaces from right end for the specified column.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ def rtrim(columnName: String): Column = rtrim(Column(columnName))
+
+ /**
+ * Format strings in printf-style.
+ *
+ * @group string_funcs
+ * @since 1.5.0
+ */
+ @scala.annotation.varargs
+ def formatString(format: Column, arguments: Column*): Column = {
--- End diff --
In Hive `select printf("ddd");` so arguments.length == 0 is reasonable, the
same for `printf`.
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