*< field is a autoincrement field */.

*< Field is binary */.

*< Intern: Used by sql_yacc */.

*< Field is a blob */.

*< field is an enum */.

Header information.

Header information.

*< Field is explicitly specified as NULL by the user */.

*< Field column format, bit 24-25 */.

flags in mysql 8.0.23 source code : include/mysql_com.h.

*< Field storage media, bit 22-23 */.

flags in mysql 8.0.23 source code : include/mysql_com.h.

* Intern: Field in TABLE object for new version of altered table, which participates in a newly added index.

*< Field part of partition func */.

*< Intern: Field is being dropped */.

* Field is explicitly marked as invisible by the user.

*< Intern: field is marked, general purpose */.

*< Intern: Field is being renamed */.

*< Used to get fields in item tree */.

*< Intern: Group field */.

Header information.

TypeInt24 bounds.

TypeInt24 bounds.

TypeInt24 bounds.

start from 1.3.0, 1.2.3.

*< Field is part of a key */.

lenenc_str.

*< Currently just a placeholder */.

.

*< Internal to MySQL.

lenenc_str.

(string.fix_len) -- (len=8) double.

(string.fix_len) -- (len=4) float.

int<4> int32.

int<4> int32.

int<8> int64.

*< Internal to MySQL.

Text ResultSet: 0xFB; Binary ResultSet: The binary protocol sends NULL values as bits inside a bitmap instead of a full byte.

int<2> int16.

lenenc_str.

add text to distinct blob and blob.

*< Internal to MySQL.

.

.

int<1> int8.

*< Used for replication only */.

lenenc_str.

lenenc_str.

int<2> int16.

*< Field doesn't have default value */.

*< Field can't be NULL */.

* Field will not be loaded in secondary engine.

*< Field is num (for clients) */.

Header information.

*< Field is set to NOW on UPDATE */.

*< Intern; Part of some key */.

*< Field is part of a primary key */.

*< field is a set */.

TEMPORARY_DBNAME used to store all temporary table created by session.

TEMPORARY_TABLE_TN_ADDR marked as virtual tn address only for temporary table When a TargetDN.address in TxnRequest is TEMPORARY_TABLE_TN_ADDR, this TxnRequest is for temporary table and execution flow will go to the func in handleTemp.

*< Field is a timestamp */.

*< Intern: Used by sql_yacc */.

*< Field is part of a unique key */.

*< Field is unsigned */.

*< Field is zerofill */.

CarryOnCtxKeys defines keys needed to be serialized when pass context through net.

The autoIncrCacheManager is initialized with a starting CN.

Determine if now is a bg sql.

EngineKey use EngineKey{} to get engine from Context.

Determine if it is a stored procedure.

PkCheckByTN whether TN does primary key uniqueness check against transaction's workspace or not.

SqlKey use SqlKey{} to get string value from Context.

StartTS is the start timestamp of a statement.

TemporaryTN use TemporaryTN to get temporary storage from Context.

Sp variable scope.