PREHOOK: query: DESCRIBE FUNCTION concat
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION concat
POSTHOOK: type: DESCFUNCTION
concat(str1, str2, ... strN) - returns the concatenation of str1, str2, ... strN or concat(bin1, bin2, ... binN) - returns the concatenation of bytes in binary data  bin1, bin2, ... binN
PREHOOK: query: DESCRIBE FUNCTION EXTENDED concat
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED concat
POSTHOOK: type: DESCFUNCTION
concat(str1, str2, ... strN) - returns the concatenation of str1, str2, ... strN or concat(bin1, bin2, ... binN) - returns the concatenation of bytes in binary data  bin1, bin2, ... binN
Returns NULL if any argument is NULL.
Example:
  > SELECT concat('abc', 'def') FROM src LIMIT 1;
  'abcdef'
PREHOOK: query: SELECT
  concat('a', 'b'),
  concat('a', 'b', 'c'),
  concat('a', null, 'c'),
  concat(null),
  concat('a'),
  concat(null, 1, 2),
  concat(1, 2, 3, 'a'),
  concat(1, 2),
  concat(1),
  concat('1234', 'abc', 'extra argument')
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT
  concat('a', 'b'),
  concat('a', 'b', 'c'),
  concat('a', null, 'c'),
  concat(null),
  concat('a'),
  concat(null, 1, 2),
  concat(1, 2, 3, 'a'),
  concat(1, 2),
  concat(1),
  concat('1234', 'abc', 'extra argument')
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
ab	abc	NULL	NULL	a	NULL	123a	12	1	1234abcextra argument
PREHOOK: query: -- binary/mixed
SELECT
  concat(cast('ab' as binary), cast('cd' as binary)),
  concat('ab', cast('cd' as binary))
FROM src tablesample (1 rows)
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: -- binary/mixed
SELECT
  concat(cast('ab' as binary), cast('cd' as binary)),
  concat('ab', cast('cd' as binary))
FROM src tablesample (1 rows)
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
abcd	abcd