Re: COALESCE patch

[Ilia Evdokimov]

While reviewing v6, I noticed try_coalesce_eq() in eqjoinsel() returns 
before the function ever looks at sjinfo->jointype, so SEMI/ANTI joins 
get the same formula meant for INNER/LEFT/FULL. I'm not sure it is true. 
Shouldn't the fat path be restricted to INNER/LEFT/FULL until SEMI/ANTI 
get their own existence-base treatment?

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Best regards,
Ilia Evdokimov,
Tantor Labs LLC,
https://tantorlabs.com/