These settings are available in system.settings and are autogenerated from source.
read_overflow_mode
Type
OverflowMode
Default
throw
What to do when the limit is exceeded.
read_overflow_mode_leaf
Type
OverflowMode
Default
throw
Sets what happens when the volume of data read exceeds one of the leaf limits.
Possible options:
throw: throw an exception (default).break: stop executing the query and return the partial result.