Fix SimpleQuery and Parse to create parser memory context if pool_memory is NULL. It is possible pool_memory is recovered to NULL.
Fix SimpleQuery and Parse to create parser memory context if
pool_memory is NULL. It is possible pool_memory is recovered to NULL.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres