The PARSE-AS-SIMPLE-DATE directive parses date strings.
parse-as-simple-date <column> <pattern>
The PARSE-AS-SIMPLE-DATE directive will parse a date string, using a pattern string. If
the column is null
or has already been parsed as a date, applying this directive is a
no-op. The column to be parsed as a date should be of type string.
See FORMAT-DATE for an explanation and example of these pattern strings.