hive - Can i concurrently set MAPJOIN hint and STREAMTABLE hint? -


can use this?

select /*+ mapjoin(t2)*//*+ streamtable(t1)*/        t1.c1.        t2.c1 t1  left outer join t2 on t1.c1 = t2.c1;

and confuse "streamtable" on different join keys.

for example: t3 biggest table,and t2 secondary big table,t1 smallest table.

select    /*+ streamtable(t2)*/   t1.c3,   t2.c2,   t3.c3  t2  left outer join  t1  on t2.c1=t1.c1  left outer join  t3 on t2.c2=t3.c2;

so if when t2 join t1 it's ok.but when t2 join t3,if t2 if still treated big table? how can handle situation?

you can achieve following:

select /*+ mapjoin(t2), streamtable(t1)*/    t1.c1.    t2.c1 t1  left outer join t2 on t1.c1 = t2.c1;

there non-trivial number of cbo-related defects might still run into, involving windowing functions , columnar formats in experience. therefore useful know how apply hints.


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