Saving all output to "!!{outputDirectory}!!/udf_substring.q.raw". Enter "record" with no arguments to stop it.
>>>  !run !!{qFileDirectory}!!/udf_substring.q
>>>  -- Synonym. See udf_substr.q
>>>  DESCRIBE FUNCTION substring;
'tab_name'
'substring(str, pos[, len]) - returns the substring of str that starts at pos and is of length len orsubstring(bin, pos[, len]) - returns the slice of byte array that starts at pos and is of length len'
1 row selected 
>>>  DESCRIBE FUNCTION EXTENDED substring;
'tab_name'
'substring(str, pos[, len]) - returns the substring of str that starts at pos and is of length len orsubstring(bin, pos[, len]) - returns the slice of byte array that starts at pos and is of length len'
'Synonyms: substr'
'pos is a 1-based index. If pos<0 the starting position is determined by counting backwards from the end of str.'
'Example:'
'   > SELECT substring('Facebook', 5) FROM src LIMIT 1;'
'  'book''
'  > SELECT substring('Facebook', -5) FROM src LIMIT 1;'
'  'ebook''
'  > SELECT substring('Facebook', 5, 1) FROM src LIMIT 1;'
'  'b''
10 rows selected 
>>>  !record