Neil Conway wrote:
Attached is a patch that applies the same optimization to int2_sum(), int4_sum(), float4_accum(), and float8_accum(). It wasn't possible to optimize do_numeric_accum() or int8_sum() since they both use numerics.



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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match

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