_oid_cache_ready _oid_oper _oper_names _oper_oid _type_names _type_oids _typeoid_cache_ready fill_oid_cache fill_oid_cache_new internal_type name_oper namestrcmp oid_oper oid_type oper_name oper_oid populate_operoid_cache populate_operoid_cache_new populate_typeoid_cache SH_DECLARE SH_DEFINE SH_ELEMENT_TYPE SH_EQUAL SH_HASH_KEY SH_KEY SH_KEY_TYPE SH_PREFIX SH_SCOPE type_oid

namestrcmp() int namestrcmp ( Name  name, const char *  str  ) Create a cache of PostgreSQL type and operator Oids in global arrays to avoid (slow) lookups. The arrays are initialized when the extension is loaded. The selectivity of Boolean operators is essential to determine efficient execution plans for queries. The extension defines several classes of Boolean operators (equal, less than, overlaps, ...), each of which can have as left or right arguments a built-in type (such as integer, timestamptz, geometry, ...) or a type defined by the extension (such as tstzspan, tint, ...). As of January 2023 there are 1470 operators defined in MobilityDB. We need to translate between operator Oid <-> MEOS operator info both ways. For Oid -> MEOS operator we use a hash table with Oid as key. For MEOS operator info -> Oid we use a three-dimensional array containing all possible combinations of operator/left argument/right argument. The invalid combinations are initialized to 0.