[jira] [Created] (BEAM-5965) RPAD

["Rui Wang (JIRA)" <ji...@apache.org>]

Rui Wang created BEAM-5965:
------------------------------

             Summary: RPAD
                 Key: BEAM-5965
                 URL: https://issues.apache.org/jira/browse/BEAM-5965
             Project: Beam
          Issue Type: Sub-task
          Components: dsl-sql
            Reporter: Rui Wang
            Assignee: Rui Wang



RPAD(original_value, return_length[, pattern])

Returns a value that consists of original_value appended with pattern. The return_length is an INT64 that specifies the length of the returned value. If original_value is BYTES, return_length is the number of bytes. If original_value is STRING, return_length is the number of characters.

The default value of pattern is a blank space.

Both original_value and pattern must be the same data type.

If return_length is less than or equal to the original_value length, this function returns the original_value value, truncated to the value of return_length. For example, RPAD("hello world", 7); returns "hello w".

If original_value, return_length, or pattern is NULL, this function returns NULL.

This function returns an error if:

return_length is negative
pattern is empty
Return type

STRING or BYTES

Examples

SELECT t, len, FORMAT("%T", RPAD(t, len)) AS RPAD FROM UNNEST([
  STRUCT('abc' AS t, 5 AS len),
  ('abc', 2),
  ('例子', 4)
]);
t	len	RPAD
abc	5	"abc  "
abc	2	"ab"
例子	4	"例子  "
SELECT t, len, pattern, FORMAT("%T", RPAD(t, len, pattern)) AS RPAD FROM UNNEST([
  STRUCT('abc' AS t, 8 AS len, 'def' AS pattern),
  ('abc', 5, '-'),
  ('例子', 5, '中文')
]);
t	len	pattern	RPAD
abc	8	def	"abcdefde"
abc	5	-	"abc--"
例子	5	中文	"例子中文中"
SELECT FORMAT("%T", t) AS t, len, FORMAT("%T", RPAD(t, len)) AS RPAD FROM UNNEST([
  STRUCT(b'abc' AS t, 5 AS len),
  (b'abc', 2),
  (b'\xab\xcd\xef', 4)
]);
t	len	RPAD
b"abc"	5	b"abc  "
b"abc"	2	b"ab"
b"\xab\xcd\xef"	4	b"\xab\xcd\xef "
SELECT
  FORMAT("%T", t) AS t,
  len,
  FORMAT("%T", pattern) AS pattern,
  FORMAT("%T", RPAD(t, len, pattern)) AS RPAD
FROM UNNEST([
  STRUCT(b'abc' AS t, 8 AS len, b'def' AS pattern),
  (b'abc', 5, b'-'),
  (b'\xab\xcd\xef', 5, b'\x00')
]);
t	len	pattern	RPAD
b"abc"	8	b"def"	b"abcdefde"
b"abc"	5	b"-"	b"abc--"
b"\xab\xcd\xef"	5	b"\x00"	b"\xab\xcd\xef\x00\x00"



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