Snowflake Client needs auto free memory mode.

[smtakeda]

PHP has its own memory management APIs, i.e., ecalloc, efree, etc, so that allocated memories will be freed up in the end of request if it wants.
However, when a connection is not closed, while all memories allocated by PDO layers will be freed automatically, the memories in Snowflake Client layer won't be, because those memories are allocated SF_CALLOC and SF_FREE that currently simple mapping to the system functions calloc and free. This will yield memory leak.

Snowflake Client/Connector should have a mode that does similar to PHP memory manager such that the memories are automatically freed in each of snowflake_*term function calls.

[smtakeda]

Alternatively would be it be good idea that the application can provide CALLOC, MALLOC, FREE call backs? This way, the application can specify the memory manager if desired.