index_has_attr()

static int16 index_has_attr ( Oid  index_oid, Oid  table_oid, int16  table_attnum  )

static

Definition at line 2148 of file gserialized_estimate.c.

{
        HeapTuple index_tuple;
        Form_pg_index index_form;
        int16 index_attnum = InvalidAttrNumber;
 
        /* Check if the index is on the desired column */
        index_tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(index_oid));
        if (!HeapTupleIsValid(index_tuple))
                elog(ERROR, "cache lookup failed for index %u", index_oid);
 
        index_form = (Form_pg_index) GETSTRUCT(index_tuple);
 
        /* Something went wrong, this index isn't on our table of interest */
        if (index_form->indrelid != table_oid)
                elog(ERROR, "table=%u and index=%u are not related", table_oid, index_oid);
 
        /* Check if the attnum is in the indkey array */
        for (int16 i = 0; i < (int16)(index_form->indkey.dim1); i++)
        {
                if (index_form->indkey.values[i] == table_attnum)
                {
                        index_attnum = i+1;
                        break;
            }
        }
        ReleaseSysCache(index_tuple);
        return index_attnum;
}

Referenced by table_get_spatial_index().

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