Description
1. ConcatWs:
https://github.com/apache/spark/blob/fabea7101ea55db991590ca2fbe1d4dfd25e5b28/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala#L70
2. FormatString
https://github.com/apache/spark/blob/fabea7101ea55db991590ca2fbe1d4dfd25e5b28/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala#L1665