branch-3.1: [feat](nereids) Add session variable enable_insert_value_auto_cast for insert value truncate long string #55325 #55414
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…r insert value truncate long string (#55325) for below sql: ```sql create table t(a int, b varchar(2)); insert into t values(1, 'abcde'); ``` for doris 2.0, the insert command will throw error 'Insert has filtered data in strict mode', because length of value 'abcde' is bigger than varchar(2). for mysql, pg, the above sql will also throw error for the same reason. for doris version >= 2.1.0, it will not throw error, and just truncate 'abcde' to 'ab'. what's more, for stream load, no matter 2.0, or 2.1, ..., doris will stream load fail. but considering 2.1 have released for 1.5+ year, we don't want to make a behaviour change for 2.1, so add a session variable enable_insert_value_auto_cast, when insert value with longer string value, then will have: - if enable_insert_value_auto_cast = true (default), the longer string will be truncate and insert succ; - if enable_insert_value_auto_cast = false, enable_insert_strict = true(default), will throw exception 'Insert has filtered data in strict mode'; - if enable_insert_value_auto_cast = false, enable_insert_strict = false, then the longer string will be filtered, other rows will insert succ. relate PR: #52802
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morrySnow
approved these changes
Sep 4, 2025
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Cherry-picked from #55325