ERROR_IF_OVERFLOW sql mode doesn‘t take effect in functions like avg

[packy92]

Steps to reproduce the behavior (Required)

1. CREATE TABLE '...'
2. INSERT INTO '....'
3. SELECT '....' https://github.com/StarRocks/starrocks/pull/30419 The above pr support error reporting when decimal overflow by introducing a OverflowMode, while only basic math function can take effect. Fucntions like agg may still return a wrong result when ERROR_IF_OVERFLOW is enabled.

Expected behavior (Required)

throw exception when set ERROR_IF_OVERFLOW

Real behavior (Required)

StarRocks version (Required)

• You can get the StarRocks version by executing SQL select current_version()