DESCRIBE FUNCTION instr;
DESCRIBE FUNCTION EXTENDED instr;

EXPLAIN
SELECT instr('abcd', 'abc'),
       instr('abcabc', 'ccc'),
       instr(123, '23'),
       instr(123, 23),
       instr(TRUE, 1),
       instr(FALSE, 1),
       instr('12345', CAST('2' AS TINYINT)),
       instr(CAST('12345' AS SMALLINT), '34'),
       instr(CAST('123456789012' AS BIGINT), '456'),
       instr(CAST(1.25 AS FLOAT), '.25'),
       instr(CAST(16.0 AS DOUBLE), '.0'),
       instr(null, 'abc'),
       instr('abcd', null)
FROM src LIMIT 1;

SELECT instr('abcd', 'abc'),
       instr('abcabc', 'ccc'),
       instr(123, '23'),
       instr(123, 23),
       instr(TRUE, 1),
       instr(FALSE, 1),
       instr('12345', CAST('2' AS TINYINT)),
       instr(CAST('12345' AS SMALLINT), '34'),
       instr(CAST('123456789012' AS BIGINT), '456'),
       instr(CAST(1.25 AS FLOAT), '.25'),
       instr(CAST(16.0 AS DOUBLE), '.0'),
       instr(null, 'abc'),
       instr('abcd', null)
FROM src LIMIT 1;