* The result of mse_nelem_max()/msc_regs_idx_limit() is a const in a specific platform. * But we couldn't hard code it explicitly because we do not k

The expthresh is represented in a encoded format in the type modifier to save metadata bits. This routine is used when the expthresh comes from a typ

If expthresh == -1 (auto select expthresh) determine the expthresh to use from nbits and nregs.

This routine is used to encode an expthresh value to be stored in the typmod metadata or a hll header.

This routine is cloned from the arrayutils ArrayGetIntegerTypmods and converted to return 64 bit integers.

* FunctionOid searches for a given function identified by schema, functionName * and argumentCount. It reports error if the function is not found or

* HllAggregateOid checkes whether the given Oid is an id of any hll aggregate * function using the pre-initialized hllAggregateArray. */

* InitializeHllAggregateOids initializes the array of hll aggregate oids. */

* MaximizeCostOfHashAggregate maximizes the cost of the path if it tries * to run hll aggregate function with hash aggregate. */

Register HLL configuration variables. */

* get_extension_schema - given an extension OID, fetch its extnamespace * Returns InvalidOid if no such extension. * * Copied from postgresql exten

_PG_fini uninstalls extension hooks */

_PG_init is the shared library initialization function */