ALL_LOSSY

In this mode, type conversions that would mean loss of information are  permitted.

This does not  imply that non-lossy conversions are permitted, merely that only cases  requiring either lossy conversions or no conversion at all are permitted; for  example, enabling only this mode permits an INT column to be converted to TINYINT (a lossy conversion), but not a TINYINT column to an INT column (non-lossy). Attempting  the latter conversion in this case would cause replication to stop with an  error on the slave.

ALL_NON_LOSSY

This mode permits conversions that do not require truncation or other  special handling of the source value; that is, it permits conversions where  the target type has a wider range than the source type.【确保从库的列类型更宽泛些也不会导致复制报错】

Setting this  mode has no bearing on whether lossy conversions are permitted; this is  controlled with the ALL_LOSSY mode. If  only ALL_NON_LOSSY is set,  but not ALL_LOSSY, then  attempting a conversion that would result in the loss of data (such as INT to TINYINT, or CHAR(25) to VARCHAR(20)) causes the slave to stop with an  error.

ALL_LOSSY,ALL_NON_LOSSY

When this mode is set, all supported type conversions are permitted, whether  or not they are lossy conversions.

ALL_SIGNED

Treat promoted integer types as signed values (the default behavior).

ALL_UNSIGNED

Treat promoted integer types as unsigned values.

ALL_SIGNED,ALL_UNSIGNED

Treat promoted integer types as signed if possible, otherwise as  unsigned.

[empty]

When slave_type_conversions is not  set, no attribute promotion or demotion is permitted; this means that all  columns in the source and target tables must be of the same types.

This mode is the default.