Github user wzhfy commented on a diff in the pull request: https://github.com/apache/spark/pull/12646#discussion_r116646341 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala --- @@ -2306,7 +2306,15 @@ object functions { * @group string_funcs * @since 1.5.0 */ - def ltrim(e: Column): Column = withExpr {StringTrimLeft(e.expr) } + def ltrim(e: Column): Column = withExpr {StringTrimLeft(Seq(e.expr))} + + /** + * Trim the specified character string from left ends for the specified string column. + * @group string_funcs + * @since 2.0.0 --- End diff -- 2.2.0?
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