zhoukang

Support iceberg v2 table

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## Enhancement v2 format can support update for iceberg table related with #1030 We will use c++ to implement the merge on read logic Phase 1: Key points 1. Only...

[BugFix] executor may be null when analysis exception thrown

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## Why I'm doing: connection will be lost when analysis exception thrown ``` MySQL [(none)]> select * from test lll 1; ERROR 2013 (HY000): Lost connection to MySQL server during...

ORC reader will return wrong result when data type is tinyint

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### Steps to reproduce the behavior (Required) 1. CREATE TABLE '...' ``` CREATE TABLE `test.app_sh01_cube_exp_post_did_analysis_new_user`( `gid` string, `appid` string, `exp_start_date` string, `exp_end_date` string, `first_enter_exp_ds` string , `exp_group` string, `is_new` string...