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If the first reference to $1 is "($1 = col) or ($1 is null)", the data type can be determined, but not for "($1 is null) or ($1 = col)". This change documents this. Reported-by: Morgan Owens Discussion: https://postgr.es/m/153233728858.1404.15268121695358514937@wrigleys.postgresql.org Backpatch-through: 9.3