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Applies to: 
Databricks SQL Databricks Runtime
Returns the concatenation strings separated by sep.
Syntax
concat_ws(sep [, expr1 [, ...] ])
Arguments
sep: An STRING expression.exprN: EachexprNcan be either a STRING or an ARRAY of STRING.
Returns
The result type is STRING.
If sep is NULL the result is NULL.
exprN that are NULL are ignored.
If only the separator is provided, or all exprN are NULL, an empty string.
Examples
> SELECT concat_ws(' ', 'Spark', 'SQL');
Spark SQL
> SELECT concat_ws('s');
''
> SELECT concat_ws(',', 'Spark', array('S', 'Q', NULL, 'L'), NULL);
Spark,S,Q,L