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https://issues.apache.org/jira/browse/BEAM-5963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Wang closed BEAM-5963.
--------------------------
Resolution: Done
Fix Version/s: Not applicable
> LPAD
> ----
>
> Key: BEAM-5963
> URL: https://issues.apache.org/jira/browse/BEAM-5963
> Project: Beam
> Issue Type: Sub-task
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
> Fix For: Not applicable
>
>
> LPAD(original_value, return_length[, pattern])
> Returns a value that consists of original_value prepended 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, LPAD("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", LPAD(t, len)) AS LPAD FROM UNNEST([
> STRUCT('abc' AS t, 5 AS len),
> ('abc', 2),
> ('例子', 4)
> ]);
> t len LPAD
> abc 5 " abc"
> abc 2 "ab"
> 例子 4 " 例子"
> SELECT t, len, pattern, FORMAT("%T", LPAD(t, len, pattern)) AS LPAD FROM
> UNNEST([
> STRUCT('abc' AS t, 8 AS len, 'def' AS pattern),
> ('abc', 5, '-'),
> ('例子', 5, '中文')
> ]);
> t len pattern LPAD
> abc 8 def "defdeabc"
> abc 5 - "--abc"
> 例子 5 中文 "中文中例子"
> SELECT FORMAT("%T", t) AS t, len, FORMAT("%T", LPAD(t, len)) AS LPAD FROM
> UNNEST([
> STRUCT(b'abc' AS t, 5 AS len),
> (b'abc', 2),
> (b'\xab\xcd\xef', 4)
> ]);
> t len LPAD
> 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", LPAD(t, len, pattern)) AS LPAD
> 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 LPAD
> b"abc" 8 b"def" b"defdeabc"
> b"abc" 5 b"-" b"--abc"
> b"\xab\xcd\xef" 5 b"\x00" b"\x00\x00\xab\xcd\xef"
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