public static Position parsePosition(List<String> specs) {
        String afterColumn = reformatName(parseAdjacentString(specs, AFTER, false));
        if (!afterColumn.isEmpty()) {
            return new Position(PositionType.AFTER, afterColumn);
        }
        return null;
    }
parse column definitions to Column list.
this method is used for createTable operation.
@param sqlType the sql type map
@param columnDefinitions the column definition list
@return the column list
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/protocol/ddl/Utils/ColumnUtils.java