fix initialization of pgspHashKey structure #40
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The size of the key used in the hash table is sizeof(pgspHashKey) = 24.
The hash is calculated for 24 bytes, but the key consists of Oid + Oid + queryid_t + uint32 = 4 + 4 + 8 + 4 = 20 bytes. Memory in pgsp_store is allocated on the stack, uninitialized and filled for 20 bytes, respectively, garbage remains in the remaining 4 bytes.
This leads to the fact that different hashes were obtained from the same key, so there was no query aggregation - each time a new entry was added to the hash table.