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Using an intersect operator against inputs with schemas that are different shouldn't be allowed. For example, one input with schema containing two attributes vs. another with schema containing five attributes. The editor allows both inputs to be linked to the intersect operator, but only the schema from the first link shows up in the intersect properties. An error/warning alert should be generated, or the link action should be prevented.
This actually applies to all Relation Operators (subtract, union, etc).