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feat: add more MySQL-compatible string functions (#7454)

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* feat: add more mysql string functions

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* refactor: use datafusion aliasing mechanism, close #7415

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* chore: comment

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* fix: comment and style

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

---------

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>
This commit is contained in:
dennis zhuang
2025-12-25 11:28:57 +08:00
committed by GitHub
parent d4870ee2af
commit 3866512cf6
12 changed files with 2461 additions and 120 deletions
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97
tests/cases/standalone/common/function/string/mysql_compat.sql Normal file
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-- MySQL-compatible string function tests
-- LOCATE function tests
SELECT LOCATE('world', 'hello world');
SELECT LOCATE('xyz', 'hello world');
SELECT LOCATE('o', 'hello world');
SELECT LOCATE('o', 'hello world', 5);
SELECT LOCATE('o', 'hello world', 6);
SELECT LOCATE('', 'hello');
SELECT LOCATE('世', 'hello世界');
SELECT LOCATE(NULL, 'hello');
SELECT LOCATE('o', NULL);
-- ELT function tests
SELECT ELT(1, 'a', 'b', 'c');
SELECT ELT(2, 'a', 'b', 'c');
SELECT ELT(3, 'a', 'b', 'c');
SELECT ELT(0, 'a', 'b', 'c');
SELECT ELT(4, 'a', 'b', 'c');
SELECT ELT(NULL, 'a', 'b', 'c');
-- FIELD function tests
SELECT FIELD('b', 'a', 'b', 'c');
SELECT FIELD('d', 'a', 'b', 'c');
SELECT FIELD('a', 'a', 'b', 'c');
SELECT FIELD('A', 'a', 'b', 'c');
SELECT FIELD(NULL, 'a', 'b', 'c');
-- INSERT function tests
SELECT INSERT('Quadratic', 3, 4, 'What');
SELECT INSERT('Quadratic', 3, 100, 'What');
SELECT INSERT('Quadratic', 0, 4, 'What');
SELECT INSERT('hello', 1, 0, 'X');
SELECT INSERT('hello世界', 6, 1, 'の');
SELECT INSERT(NULL, 1, 1, 'X');
-- SPACE function tests
SELECT SPACE(5);
SELECT SPACE(0);
SELECT SPACE(-1);
SELECT CONCAT('a', SPACE(3), 'b');
SELECT SPACE(NULL);
-- FORMAT function tests
SELECT FORMAT(1234567.891, 2);
SELECT FORMAT(1234567.891, 0);
SELECT FORMAT(1234.5, 4);
SELECT FORMAT(-1234567.891, 2);
SELECT FORMAT(0.5, 2);
SELECT FORMAT(123, 2);
SELECT FORMAT(NULL, 2);
-- Combined test with table
CREATE TABLE string_test(idx INT, val VARCHAR, ts TIMESTAMP TIME INDEX);
INSERT INTO string_test VALUES
(1, 'hello world', 1),
(2, 'foo bar baz', 2),
(3, 'hello世界', 3);
SELECT idx, val, LOCATE('o', val) as loc FROM string_test ORDER BY idx;
SELECT idx, val, INSERT(val, 1, 5, 'hi') as inserted FROM string_test ORDER BY idx;
DROP TABLE string_test;