Add EnforceSingleRow operator #240
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This operator enforces that input has no more than one row and returns that row unmodified. If input is empty, this operator returns a single row with all values set to null. If input has more than one row, this operator throws an exception and aborts the query. This operator is used in query plans that have non-correlated sub-queries, e.g. SELECT name FROM tpch.tiny.nation WHERE regionkey = (SELECT max(regionkey) FROM tpch.tiny.region)
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This operator enforces that input has no more than one row and returns that row
unmodified. If input is empty, this operator returns a single row with all
values set to null. If input has more than one row, this operator throws an
exception and aborts the query.
This operator is used in query plans that have non-correlated sub-queries, e.g.