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9823e75d16
In preparation of the relaxation of the grammar to return any expression, change the whereClause production to return an expression rather than terms. Note that the expression is still constrained to be a conjunction of relations, and our filtering code isn't prepared for more. Before the patch, if the WHERE clause was optional, the grammar would pass an empty vector of expressions (which is exactly correct). After the patch, it would pass a default-constructed expression. Now that happens to be an empty conjunction, which is exactly what's needed, but it is too accidental, so the patch changes optional WHERE clauses to explicitly generate an empty conjunction if the WHERE clause wasn't specified.