Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/18046#discussion_r117628733
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -277,6 +277,8 @@ object FunctionRegistry {
// string functions
expression[Ascii]("ascii"),
expression[Base64]("base64"),
+ expression[BitLength]("bit_length"),
+ expression[Length]("char_length"),
--- End diff --
I think that `length` is an alias of `octet_length` in mysql. In
postgreSql, `length` is alias an of `char_length`.
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