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81f2673883
As agreed in JIRA discussions, the current PR extends existing TRIM
functionality with the support of SQL-standardized TRIM-FROM syntax:
TRIM({[LEADING / TRAILING / BOTH] | [STRING characters]} FROM expr).
Implemented based on the existing LTRIM / RTRIM / BTRIM family of
functions prepared earlier in IMPALA-6059 and extended for UTF-8 in
IMPALA-12718. Besides, partly based on abandoned PR
https://gerrit.cloudera.org/#/c/4474 and similar EXTRACT-FROM
functionality from https://github.com/apache/impala/commit/543fa73f3a846
f0e4527514c993cb0985912b06c.
Supported syntaxes:
Syntax #1 TRIM(<where> FROM <string>);
Syntax #2 TRIM(<charset> FROM <string>);
Syntax #3 TRIM(<where> <charset> FROM <string>);
"where": Case-insensitive trim direction. Valid options are "leading",
"trailing", and "both". "leading" means trimming characters from the
start; "trailing" means trimming characters from the end; "both" means
trimming characters from both sides. For Syntax #2, since no "where"
is specified, the option "both" is implied by default.
"charset": Case-sensitive characters to be removed. This argument is
regarded as a character set going to be removed. The occurrence order
of each character doesn't matter and duplicated instances of the same
character will be ignored. NULL argument implies " " (standard space)
by default. Empty argument ("" or '') makes TRIM return the string
untouched. For Syntax #1, since no "charset" is specified, it trims
" " (standard space) by default.
"string": Case-sensitive target string to trim. This argument can be
NULL.
The UTF8_MODE query option is honored by TRIM-FROM, similarly to
existing TRIM().
UTF8_TRIM-FROM can be used to force UTF8 mode regardless of the query
option.
Design Notes:
1. No-BE. Since the existing LTRIM / RTRIM / BTRIM functions fully cover
all needed use-cases, no backend logic is required. This differs from
similar EXTRACT-FROM.
2. Syntax wrapper. TrimFromExpr class was introduced as a syntax
wrapper around FunctionCallExpr, which instantiates one of the regular
LTRIM / RTRIM / BTRIM functions. TrimFromExpr's role is to maintain
the integrity of the "phantom" TRIM-FROM built-in function.
3. No TRIM keyword. Following EXTRACT-FROM, no "TRIM" keyword was
added to the language. Although generally a keyword would allow easier
and better parsing, on the negative side it restricts token's usage in
general context. However, leading/trailing/both, being previously
saved as reserved words, are now added as keywords to make possible
their usage with no escaping.
Change-Id: I3c4fa6d0d8d0684c4b6d8dac8fd531d205e4f7b4
Reviewed-on: http://gerrit.cloudera.org:8080/21825
Reviewed-by: Csaba Ringhofer <csringhofer@cloudera.com>
Tested-by: Csaba Ringhofer <csringhofer@cloudera.com>
580 lines
13 KiB
Plaintext
580 lines
13 KiB
Plaintext
====
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---- QUERY
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set utf8_mode=true;
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select length('你好'), length('你好hello'), length('你好 hello 你好')
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---- RESULTS
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2,7,11
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---- TYPES
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INT,INT,INT
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====
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---- QUERY
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set utf8_mode=false;
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select length('你好'), length('你好hello'), length('你好 hello 你好')
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---- RESULTS
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6,11,19
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---- TYPES
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INT,INT,INT
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====
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---- QUERY
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set utf8_mode=true;
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select substring('你好hello', 1, 3)
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---- RESULTS: RAW_STRING
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'你好h'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=false;
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select substring('你好hello', 1, 3)
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---- RESULTS: RAW_STRING
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'你'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select reverse('你好hello你好');
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---- RESULTS: RAW_STRING
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'好你olleh好你'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=off;
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select id, length(name), substring(name, 1, 3), length(substring(name, 1, 3)) from utf8_str_tiny
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---- RESULTS: RAW_STRING
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1,6,'张',3
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2,6,'李',3
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3,6,'王',3
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4,9,'李',3
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5,5,'Ali',3
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6,6,'陈',3
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7,7,'Бo',3
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8,5,'Jö',3
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9,9,'ひ',3
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10,6,'서',3
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---- TYPES
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INT,INT,STRING,INT
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====
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---- QUERY
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set utf8_mode=true;
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select id, length(name), substring(name, 1, 2), reverse(name) from utf8_str_tiny
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---- RESULTS: RAW_STRING
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1,2,'张三','三张'
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2,2,'李四','四李'
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3,2,'王五','五王'
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4,3,'李小','龙小李'
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5,5,'Al','ecilA'
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6,4,'陈B','boB陈'
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7,5,'Бo','cиpoБ'
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8,4,'Jö','gröJ'
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9,3,'ひな','たなひ'
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10,2,'서연','연서'
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---- TYPES
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INT,INT,STRING,STRING
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====
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---- QUERY
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# Test utf8 functions in where clause.
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set utf8_mode=true;
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select id, name from functional.utf8_str_tiny
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where length(name) = 2 and substring(name, 1, 1) = '李';
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---- RESULTS: RAW_STRING
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2,'李四'
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---- TYPES
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INT,STRING
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====
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---- QUERY
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# Test utf8 functions in group by clause. group_concat() may produce undetermined results
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# due to the order. Here we wrap it with length().
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set utf8_mode=true;
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select substring(name, 1, 1), length(group_concat(name)) from functional.utf8_str_tiny
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group by substring(name, 1, 1);
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---- RESULTS: RAW_STRING
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'A',5
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'ひ',3
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'陈',4
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'王',2
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'张',2
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'서',2
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'J',4
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'Б',5
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'李',7
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---- TYPES
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STRING,INT
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====
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---- QUERY
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# Test utf8 functions in group by and having clauses. group_concat() may produce
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# undetermined results due to the order. Here we wrap it with length().
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set utf8_mode=true;
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select substring(name, 1, 1), length(group_concat(name)) from functional.utf8_str_tiny
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group by substring(name, 1, 1)
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having length(group_concat(name)) = 7;
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---- RESULTS: RAW_STRING
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'李',7
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---- TYPES
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STRING,INT
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====
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---- QUERY
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# Each Chinese character is encoded into 3 bytes in UTF-8.
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set utf8_mode=false;
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select instr('最快的SQL引擎跑SQL', 'SQL'),
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instr('最快的SQL引擎跑SQL', '引擎'),
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instr('最快的SQL引擎跑SQL', 'SQL引擎'),
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instr('最快的SQL引擎跑SQL', '跑SQL'),
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instr('最快的SQL引擎跑SQL', 'SQL', 1, 2),
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instr('最快的SQL引擎跑SQL', 'SQL', -1, 2);
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---- RESULTS
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10,13,10,19,22,10
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---- TYPES
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INT,INT,INT,INT,INT,INT
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====
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---- QUERY
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set utf8_mode=true;
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select instr('最快的SQL引擎跑SQL', 'SQL'),
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instr('最快的SQL引擎跑SQL', '引擎'),
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instr('最快的SQL引擎跑SQL', 'SQL引擎'),
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instr('最快的SQL引擎跑SQL', '跑SQL'),
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instr('最快的SQL引擎跑SQL', 'SQL', 1, 2),
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instr('最快的SQL引擎跑SQL', 'SQL', -1, 2);
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---- RESULTS
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4,7,4,9,10,4
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---- TYPES
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INT,INT,INT,INT,INT,INT
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====
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---- QUERY
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# Each Chinese character is encoded into 3 bytes in UTF-8.
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set utf8_mode=false;
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select locate('SQL', '最快的SQL引擎跑SQL'),
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locate('引擎', '最快的SQL引擎跑SQL'),
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locate('SQL引擎', '最快的SQL引擎跑SQL'),
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locate('跑SQL', '最快的SQL引擎跑SQL'),
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locate('SQL', '最快的SQL引擎跑SQL', 4),
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locate('SQL', '最快的SQL引擎跑SQL', 11);
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---- RESULTS
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10,13,10,19,10,22
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---- TYPES
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INT,INT,INT,INT,INT,INT
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====
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---- QUERY
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set utf8_mode=true;
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select locate('SQL', '最快的SQL引擎跑SQL'),
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locate('引擎', '最快的SQL引擎跑SQL'),
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locate('SQL引擎', '最快的SQL引擎跑SQL'),
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locate('跑SQL', '最快的SQL引擎跑SQL'),
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locate('SQL', '最快的SQL引擎跑SQL', 4),
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locate('SQL', '最快的SQL引擎跑SQL', 10);
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---- RESULTS
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4,7,4,9,4,10
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---- TYPES
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INT,INT,INT,INT,INT,INT
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====
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---- QUERY
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set utf8_mode=true;
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select mask('SQL引擎', 'x', 'x', 'x', 'x'),
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mask_last_n('SQL引擎', 2, 'x', 'x', 'x', 'x'),
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mask_show_first_n('SQL引擎', 2, 'x', 'x', 'x', 'x'),
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mask_first_n('SQL引擎', 2, 'x', 'x', 'x', 'x'),
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mask_show_last_n('SQL引擎', 2, 'x', 'x', 'x', 'x');
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---- RESULTS: RAW_STRING
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'xxxxx','SQLxx','SQxxx','xxL引擎','xxx引擎'
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---- TYPES
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STRING,STRING,STRING,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('abcd áäèü ABCD ÁÄÈÜ');
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---- RESULTS: RAW_STRING
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'xxxx xxxx XXXX XXXX'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('Ich möchte ein Bier. Tschüss');
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---- RESULTS: RAW_STRING
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'Xxx xxxxxx xxx Xxxx. Xxxxxxx'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('Hungarian áéíöóőüúű ÁÉÍÖÓŐÜÚŰ');
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---- RESULTS: RAW_STRING
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'Xxxxxxxxx xxxxxxxxx XXXXXXXXX'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('German äöüß ÄÖÜẞ');
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---- RESULTS: RAW_STRING
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'Xxxxxx xxxx XXXX'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('French àâæçéèêëïîôœùûüÿ ÀÂÆÇÉÈÊËÏÎÔŒÙÛÜŸ');
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---- RESULTS: RAW_STRING
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'Xxxxxx xxxxxxxxxxxxxxxx XXXXXXXXXXXXXXXX'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask('Greek αβξδ άέήώ ΑΒΞΔ ΆΈΉΏ 1234');
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---- RESULTS: RAW_STRING
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'Xxxxx xxxx xxxx XXXX XXXX nnnn'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask_first_n('áéíöóőüúű');
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---- RESULTS: RAW_STRING
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'xxxxóőüúű'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask_show_first_n('áéíöóőüúű');
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---- RESULTS: RAW_STRING
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'áéíöxxxxx'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask_last_n('áéíöóőüúű');
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---- RESULTS: RAW_STRING
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'áéíöóxxxx'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=true;
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select mask_show_last_n('áéíöóőüúű')
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---- RESULTS: RAW_STRING
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'xxxxxőüúű'
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---- TYPES
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STRING
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====
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---- QUERY
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set utf8_mode=false;
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select upper('abcd áäèü'), lower('ABCD ÁÄÈÜ'), initcap('abcd áäèü ABCD ÁÄÈÜ');
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---- RESULTS: RAW_STRING
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'ABCD áäèü','abcd ÁÄÈÜ','Abcd áäèü Abcd ÁÄÈÜ'
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---- TYPES
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STRING,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select upper('abcd áäèü'), lower('ABCD ÁÄÈÜ'), initcap('abcd áäèü ABCD ÁÄÈÜ');
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---- RESULTS: RAW_STRING
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'ABCD ÁÄÈÜ','abcd áäèü','Abcd Áäèü Abcd Áäèü'
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---- TYPES
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STRING,STRING,STRING
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====
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---- QUERY
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set utf8_mode=false;
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select id, upper(name), lower(name), initcap(name) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','张三','张三'
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2,'李四','李四','李四'
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3,'王五','王五','王五'
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4,'李小龙','李小龙','李小龙'
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5,'ALICE','alice','Alice'
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6,'陈BOB','陈bob','陈bob'
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7,'БOPиC','Бopиc','Бopиc'
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8,'JöRG','jörg','Jörg'
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9,'ひなた','ひなた','ひなた'
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10,'서연','서연','서연'
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---- TYPES
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INT,STRING,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, upper(name), lower(name), initcap(name) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','张三','张三'
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2,'李四','李四','李四'
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3,'王五','王五','王五'
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4,'李小龙','李小龙','李小龙'
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5,'ALICE','alice','Alice'
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6,'陈BOB','陈bob','陈bob'
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7,'БOPИC','бopиc','Бopиc'
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8,'JÖRG','jörg','Jörg'
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9,'ひなた','ひなた','ひなた'
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10,'서연','서연','서연'
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---- TYPES
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INT,STRING,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, ltrim(name, substr(name, 1, 1)) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','三'
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2,'李四','四'
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3,'王五','五'
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4,'李小龙','小龙'
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5,'Alice','lice'
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6,'陈Bob','Bob'
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7,'Бopиc','opиc'
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8,'Jörg','örg'
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9,'ひなた','なた'
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10,'서연','연'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, trim(leading substr(name, 1, 1) from name) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','三'
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2,'李四','四'
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3,'王五','五'
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4,'李小龙','小龙'
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5,'Alice','lice'
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6,'陈Bob','Bob'
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7,'Бopиc','opиc'
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8,'Jörg','örg'
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9,'ひなた','なた'
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10,'서연','연'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, rtrim(name, substr(name, 2)) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','张'
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2,'李四','李'
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3,'王五','王'
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4,'李小龙','李'
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5,'Alice','A'
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6,'陈Bob','陈'
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7,'Бopиc','Б'
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8,'Jörg','J'
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9,'ひなた','ひ'
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10,'서연','서'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, trim(trailing substr(name, 2) from name) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','张'
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2,'李四','李'
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3,'王五','王'
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4,'李小龙','李'
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5,'Alice','A'
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6,'陈Bob','陈'
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7,'Бopиc','Б'
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8,'Jörg','J'
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9,'ひなた','ひ'
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10,'서연','서'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, ltrim(name, '张李王小A陈БJひ서') from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','三'
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2,'李四','四'
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3,'王五','五'
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4,'李小龙','龙'
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5,'Alice','lice'
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6,'陈Bob','Bob'
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7,'Бopиc','opиc'
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8,'Jörg','örg'
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9,'ひなた','なた'
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10,'서연','연'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, trim(leading '张李王小A陈БJひ서' from name) from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','三'
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2,'李四','四'
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3,'王五','五'
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4,'李小龙','龙'
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5,'Alice','lice'
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6,'陈Bob','Bob'
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7,'Бopиc','opиc'
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8,'Jörg','örg'
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9,'ひなた','なた'
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10,'서연','연'
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---- TYPES
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INT,STRING,STRING
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====
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---- QUERY
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set utf8_mode=true;
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select id, name, rtrim(name, '三四五小龙') from utf8_str_tiny;
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---- RESULTS: RAW_STRING
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1,'张三','张'
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2,'李四','李'
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3,'王五','王'
|
||
4,'李小龙','李'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, name, trim(trailing '三四五小龙' from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三','张'
|
||
2,'李四','李'
|
||
3,'王五','王'
|
||
4,'李小龙','李'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, name, btrim(name, '！？。，：；‘’“”≠≥≤∞ε∑∫√') from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三','张三'
|
||
2,'李四','李四'
|
||
3,'王五','王五'
|
||
4,'李小龙','李小龙'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, name, trim('！？。，：；‘’“”≠≥≤∞ε∑∫√' from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三','张三'
|
||
2,'李四','李四'
|
||
3,'王五','王五'
|
||
4,'李小龙','李小龙'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=false;
|
||
select id, name, utf8_trim('！？。，：；‘’“”≠≥≤∞ε∑∫√' from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三','张三'
|
||
2,'李四','李四'
|
||
3,'王五','王五'
|
||
4,'李小龙','李小龙'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=false;
|
||
select id, name, utf8_trim('！？。，：；‘’“”≠≥≤∞ε∑∫√' from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三','张三'
|
||
2,'李四','李四'
|
||
3,'王五','王五'
|
||
4,'李小龙','李小龙'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, unnest(arr2) as item, trim(unnest(arr2) from "aaYYBBoo") from complextypes_arrays order by id, item;
|
||
---- RESULTS: RAW_STRING
|
||
1,'five','aaYYBBoo'
|
||
1,'four','aaYYBB'
|
||
1,'one','aaYYBB'
|
||
1,'three','aaYYBBoo'
|
||
1,'two','aaYYBB'
|
||
2,'five','aaYYBBoo'
|
||
2,'one','aaYYBB'
|
||
2,'three','aaYYBBoo'
|
||
2,'two','aaYYBB'
|
||
2,'NULL','aaYYBBoo'
|
||
3,'ten','aaYYBBoo'
|
||
4,'eight','aaYYBBoo'
|
||
4,'nine','aaYYBBoo'
|
||
4,'ten','aaYYBBoo'
|
||
5,'eleven','aaYYBBoo'
|
||
5,'ten','aaYYBBoo'
|
||
5,'thirteen','aaYYBBoo'
|
||
5,'twelve','aaYYBBoo'
|
||
6,'str1','aaYYBBoo'
|
||
6,'str2','aaYYBBoo'
|
||
9,'str1','aaYYBBoo'
|
||
9,'str2','aaYYBBoo'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, name, trim(first_value(name) over (order by id) from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三',''
|
||
2,'李四','李四'
|
||
3,'王五','王五'
|
||
4,'李小龙','李小龙'
|
||
5,'Alice','Alice'
|
||
6,'陈Bob','陈Bob'
|
||
7,'Бopиc','Бopиc'
|
||
8,'Jörg','Jörg'
|
||
9,'ひなた','ひなた'
|
||
10,'서연','서연'
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|
||
---- QUERY
|
||
set utf8_mode=true;
|
||
select id, name, trim(name from name) from utf8_str_tiny;
|
||
---- RESULTS: RAW_STRING
|
||
1,'张三',''
|
||
2,'李四',''
|
||
3,'王五',''
|
||
4,'李小龙',''
|
||
5,'Alice',''
|
||
6,'陈Bob',''
|
||
7,'Бopиc',''
|
||
8,'Jörg',''
|
||
9,'ひなた',''
|
||
10,'서연',''
|
||
---- TYPES
|
||
INT,STRING,STRING
|
||
====
|