My program (indirectly) calls the following function twice,

tuple = SearchSysCache(STATRELATT, ObjectIdGetDatum(relid),

Int16GetDatum(colnum),  0, 0);

The first time it assigns NULL to tuple, while the second time it
assigns a valid pointer. Why is it like that?  BTW, my program only
optimize query plan without executing it.


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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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