presto-main/src/main/java/io/prestosql/sql/analyzer/ExpressionAnalyzer.java/Visitor/visitInListExpression
class Visitor:        @Override
        protected Type visitInListExpression(InListExpression node, StackableAstVisitorContext<Context> context)
        {
            Type type = coerceToSingleType(context, "All IN list values must be the same type: %s", node.getValues());

            setExpressionType(node, type);
            return type; // TODO: this really should a be relation type
        }